The British Aerospace BAe-146

Iforward-retracting nose wheel and two
                 Aircraft manufacturersoutboard-displaced main units which retracted inwards
had, for some four decades, attempted to designinto blister-type fairings on the fuselage’s sides. 
the elusive DC-3 replacement with differentAll featured Dunlop wheels, while the main gear’s
powerplant types, including the piston-engined Convairmulti-disc carbon brakes had only been previously
240/340/440 and Martin 2-0-2/4-0-4 series and theemployed by Concorde.
turboprop Vickers Viscount, Fokker F.27 Friendship,                Two 3,000-psi hydraulic
and Hawker Siddeley HS.748.  The latest attemptsystems powered the trailing edge flaps, the petal air
had been made by the British aircraft industry whenbrakes, the undercarriage, and the wheel brakes.  A
both de Havilland and Hawker Siddeley had conductedGarrett AiResearch GTCP 36-100M auxiliary power
market research and formulated designs for aunit had provided cabin conditioning and engine
small-capacity, short-range airliner powered bystarting power and had been operable up to 20,000
pure-jet engines during 1959 and 1960.feet.
                Of the two, de Havilland,                With an 84,000-pound
with its previous Rapide, Dove, and Heronmaximum take off weight, the BAe-146-100 had an
pistonliners, had had considerable regional aircraft880-nautical mile range with its maximum payload and
experience and had designed the world’s firsta 1,620-nautical mile range with its maximum fuel.
pure-jet airliner in the form of the quad-engined                First flying on September 3,
DH.106 Comet.  An initial study for such a DC-31981, on a one-hour, 35-minute fight at a
replacement, designated the DH.123, had featured a64,000-pound take off weight, the BAe-146-100 had
60.6-foot overall length, an 81.3-foot wingspan, twobeen pronounced as “remarkably stable, very
1,150 shp Gnone turboprops attached to a high wing,responsive, and delightfully quiet” by its test pilot
and a 22,100-pound maximum take off weight.  Soand had been awarded its Civil Aviation Authority
configured, it would have accommodated between(CAA) type certificate on February 4, 1983.  FAA
32 and 40 passengers, or slightly more than thecertification followed three months later, on May 20.
DC-3’s standard 21 to 28.                Dan-Air Services, Ltd., the
                De Havilland, subsequentlytype’s launch customer, had placed two firm and
taken over by Hawker Siddeley and redesignated thetwo optioned orders the previous September, and
“de Havilland Division,” had forciblyinaugurated it into scheduled service on March 1,
discontinued design work on the DH.123 because it1983, with an intermittently-provided aircraft from
would have competed too closely with HawkerBritish Aerospace, on the London/Gatwick-Berne,
Siddeley’s own Rolls Royce Dart-powered AvroSwitzerland route, before it deployed its own aircraft
748 which had seated 44.  Nevertheless, existingon the route as of May 27.  The BAe-146 had been
turboprop competition, coupled with dethe only pure-jet airliner which had been capable of
Havilland’s belief that pure-jet technology wouldoperating from Berne’s short runway.
attract considerable passenger appeal, resulted in the                The larger, BAe-146-200,
mid-1960 DH.126 design proposal, which featured thewith a five-frame stretch, featured a new, 93.10-foot
later-standard configuration of most low-capacity,overall length and could accommodate 100
short-range twin-jets, such as the SE.210 Caravelle,passengers in a six-abreast configuration at a 33-inch
the BAC-111, and the DC-9, with a swept wing,seat pitch or a maximum of 112 at a 29-inch pitch,
aft-mounted engines, and a t-tail.  Powered by twobut otherwise retained the BAe-146-100’s
3,860 thrust-pound de Havilland PS92 jet engines, itwingspan.  The aircraft, with a 93,000-pound
had featured a 60.3-foot length for accommodationmaximum take off weight, had a 1,130-nautical mile
of 30 passengers and a 62-foot wingspan.range with a full payload or a 1,570-nautical mile range
                Several iterations hadwith full fuel.
introduced progressive, although moderate wingspan,                First flying on August 1,
thrust, and gross weight increases by 1964, but1982 and registered G-WISC, the type had been
further development had been hampered by fourinaugurated into service the following year, on June
fundamental obstacles:27, by Air Wisconsin, which had placed an order for
1. Suitable pure-jet engine availability.four firm and four optioned aircraft, configured for
2. Discontinuation of promising engine development100, on May 20, 1981, the same day that the
because of several mid-1960s British engineshorter-fuselage variant had first rolled out.  Joining a
manufacturer mergers.fleet of Fairchild Swearingen Metro IIs and de
3. Higher seat-mile costs over DC-3-like sectors forHavilland of Canada DHC-7 turboprops, the
which the new design had been intended.BAe-146-200 had been deployed on average, 127-mile
4. The inability to exploit a pure-jet airliner’sroute sectors, rarely climbing higher than 17,000 feet,
speed over relatively short sectors.and by the spring of 1984, it had served 16
                Hawker Siddeley, believingmid-western cities, operating 14 daily sectors per
that the turboprop engine had only been interim-stepday.  It ultimately replaced the turboprops.
technology, had equally embarked on a pure-jet                The largest single order, for
airliner design program of its own long before the de20 firm and 25 options, had been placed by another
Havilland merger, although its low-wing, aft-engined,US regional carrier, Pacific Southwest Airlines (PSA),
t-tailed configurations had strongly resembled itswhile other US operators had included Air-Pac of the
former competitor’s.Aleutian Islands in Alaska, Aspen Airways, Air-Cal,
                Attempting to minimizeAmerican Airlines, Discovery Airways of Hawaii,
development costs by utilizing the cockpit, forwardPresidential Airways, Royal West, USAir, and WestAir
fuselage, systems, and passenger cabin of its ownCommuter.
Avro 748, it had proposed the HS.131 in 1964, which                The BAe-146 had been the
had featured similar 62.8-foot overall lengths andfirst pure-jet to have been certified to operate from
67-foot wingspans as de Havilland’s comparableLondon City STOLport, located in the docklands
DH.126, but its projected 5,000 thrust-pound Rollsregion, because of its steep approach capability,
Royce RB.172 engines had enabled it to offer ashort-runway performance, and low noise emission.
higher, 30,000-pound gross weight and a                In order to further expand
32-passenger capacity.its product line, offer increased passenger capacity,
                Faced, like de Havilland, withand more adequately compete with Fokker’s
engine unsuitability and unavailability, Hawker Siddeleyown advanced, stretched F.100, British Aerospace
devised iterations round projected powerplants.  Aoffered a second stretch over its original
radical configuration change, introduced by the HS.136BAe-146-100, which had entailed 8.1-foot forward and
of 1967, for instance, had resulted in a low-wing7.8-foot aft fuselage plugs in comparison to the
aircraft powered by two 9,730 thrust-pound RollsBAe-146-200.  The resultant version, the
Royce Trent engines with a conventional tailBAe-146-300, featured a strengthened center section
accommodating 57 passengers in a five-abreast cabinfuselage and a new 100-foot, 8 ¼-inch overall
and offering a 54,000-pound maximum take offlength, but otherwise employed the same wingspan
weight.  Although the arrangement would haveand ALF-502R-5 turbofans.  Single-class, five-abreast
eliminated the aft-mounted, t-tail’s propensitycapacity, at a 31-inch seat pitch, had been 103,
toward deep-stall and flame-out conditions, and itsalthough 128 high-density passengers, at a 29-inch
close ground proximity would have facilitatedseat pitch, could be accommodated with the addition
passenger, aircraft servicing, and maintenance access,of type III emergency exits installed in the center
the potential for foreign object debris (FOD) enginefuselage.  The 97,500-pound variant, with a
ingestion had yielded to the proposed HS.144 two1,040-nautical mile range with a full payload and a
years later, which had once again reverted to the1,520-nautical mile range with full fuel, had first flown
now standard aft-engine configuration.on May 1, 1987, after the BAe-146-100 prototype
                Progressive design(G-SSSH) had been converted to this standard and
evolutions and dimensional and thrust increases hadreregistered G-LUXE.
intermittently resulted in an airplane whose passenger                Air Wisconsin, again launch
capacity had been double that of the DC-3’s,customer for the version, had taken delivery of its
and with the Rolls Royce bankruptcy-sparkedfirst longer-fuselage BAe-146-300 on December 10,
discontinuation of Trent development in 1970, the1988, one of five which had comprised its previous
DC-3 replacement, now powerless, had become everorder for -200s.
more elusive.                A freighter version, the
                This low-capacity,BAe-146-QT Quiet Trader, had been available in all
short-range jetliner had, like never before, hingedthree passenger versions.  Incorporating an
upon a powerplant for its existence, and the onlyupward-opening, hydraulically-operated, 10.11-by-6.4
potential lay with a small turbofan being developed byfoot door on its aft, left side; a strengthened floor;
Avco Lycoming in the US.  Based upon the 7,000and a loading system; the aircraft, devoid of
thrust-pound F102 which had powered the Northroppassenger windows and facilities, could accommodate
A-9A, the engine, a derated civil derivativenine LD-3 containers or six 108-by-88 inch pallets of
designated ALF-502, had been launched in 1969 forup to 6,000 pounds each and a single 53-by-88 inch
the Canadair CL-601 Challenger business jet and hadhalf pallet.  The prototype, a BAe-146-200
first run two years later.  In order to offerconverted by Hayes International Corporation, had
commercial application, it had been of modularfirst flown on March 20, 1986 and had been
construction.inaugurated into service by TNT International Aviation
                Because the type’sServices the following year on May 5.  The operator
6,500 thrust-pound rating had been inadequate forhad subsequently acquired a considerable number of
the latest aircraft design, the HS.146 of 1971, andthem.
because no other suitable powerplant had been in the II
development stage, the ultimate DC-3 replacement                 A representative
had been forcibly designed round four, not two,BAe-146-200 flight, operated by Air Zimbabwe from
engines and it featured neither the standard, aftHwange to Kariba, had been taken in September of
engine-mounted, t-tailed nor alternative wing-mounted1994.
configuration.  Instead, it would sport two high,                Founded in 1967 as Air
modestly swept wings to which the four turbofansRhodesia to operate the Rhodesian routes of Central
would be pylon-mounted.  Accommodating 88African Airways, the carrier, continually changing as a
passengers, or three times as many as the DC-3, theresult of increased black majority rule, had been
airliner, with an 86.2-foot length and 84.10-footredesignated Air Rhodesia-Zimbabwe in 1979 and,
wingspan, had a 70,000-pound gross weight andsimply, Air Zimbabwe the following year after the
700-nautical mile range.country had attained independence.  The transition
                Nevertheless, the HS.146period, fraught with political instability, had sparked
offered several advantages over the earlier,constant route structure realignment, which had only
standard-arrangement de Havilland and Hawkerencompassed South Africa.
Siddeley design studies.  Short-field performance,                When the internal situation
fully the equivalent of the turboprops it had intendedhad ultimately been restabilized, the route system
to replace, had been attained by its thrust-to-weighthad been gradually reestablished, once again offering
ratio and wing, which, with 78-percent coverage ofconnections between Zimbabwe and many regional
its trailing edge with Fowler flaps, had obviated theAfrican nations, as well as those in Europe.  In 1982,
need for leading edge devices, and simplification andAir Zimbabwe had operated eight Viscounts, three
weight reduction had been further achieved with the720Bs, and three 707-320Bs, although additional 707s
elimination of thrust reversers.  The t-tail, remaininghad later replaced the 720s.
from the earlier designs, had been retained in order                Due to
to avoid engine and wing turbulence interference.deregulation-spawned competition, the small carrier
                The four engine pods, whichhad increased its efforts to remain competitive with
had been interchangeable with each other, housedimproved passenger service and a more modern,
modular construction cores built up of the basic fan,three-type fleet which had included one BAe-146-200,
the accessory gearbox, the gas producerthree 737-200s, and two 767-200ERs, serving the
compressor, and the combustion turbine sections.five Zimbabwean domestic destinations of Bulawayo,
                An 11.8-foot fuselageHarare, Hwange, Kariba, and Victoria Falls; the 11
diameter had permitted an internal, six-abreast coachAfrican international destinations of Dar-es-Salaam,
seating arrangement, which had been double that ofDurban, Gabarone, Johannesburg, Lilongwe, Lusaka,
the DC-3’s.Manzini, Maputo, Mauritius, Nairobi, and Windhoek; and
                In order to cater tothe three European intercontinental destinations of
different route demands, Hawker Siddeley offered anFrankfurt, Larnaca, and London.
initial, 88-passenger HS-146-100 and a stretched,                In June of 1983, it had
102-passenger HS.146-200 version, both at maximum,embarked on a “Customer Care Program” to
six-abreast densities, although capacity could beimprove service and introduce a new Executive
reduced with varying class, seat pitch, and abreastBusiness Class on its two widebody aircraft in order
arrangements.to more effectively compete with the larger,
                Fully intended as a pure-jetinternational carriers which had operated between
counterpart to the turboprop Viscount, HS.748, andEurope and Africa.
F.27, the HS.146 had been optimized for multiple daily,                It had toted three slogans:
high frequency, short-range sectors from short and“A Tradition of Caring,” in 1989; “Above
unprepared, gravel runways, yet achieve 15-percentAll, We Care,” in 1992; and “Experience our
lower direct-operating-costs than these aircraft. Commitment to Excellence,” in 1994.
Slow, controlled approach speeds, of just over 100                Its self-stated goal had been
knots, had been attainable by its aft fuselage, petal“to be the airline that best meets the needs of
airbrakes and 40 degrees of trailing edge flap,the customer, to operate profitably, and to
permitting operation from 5,000-foot runways.contribute to the development of Zimbabwe using
                Hawker Siddeley hadthe skills and talents of a committed workforce.”
estimated a market of 1,500 aircraft of its type by                The BAe-146-200 operating
1982.the day’s flight, registered Z-WPD and named
                HS.146 program launch,“Jungwe,” had been configured with 91
based upon a 40 million British pound governmentsingle-class, six-abreast seats and had been fitted
backing and the manufacturer’s own investment,with a passenger audio system.  Routed from
had occurred on August 29, 1973, and the first flight,Victoria Falls to Hwange, Kariba, and Harare under
of the short-fuselage HS.146-100, had been targetedflight number “UM 229,” it operated three
for December of that year with certification followingsectors spanning 30 minutes, one hour, and 45
in February of 1977, while the stretched HS.146-200,minutes in duration.
coinciding with the seventh airframe, had been                After boarding from the
targeted for certification in August of 1978.  Asingle terminal by means of its forward, left airstair,
full-scale wooden mock-up had been intermittentlythe high-wing, quad-engined British regional jet,
built at Hatfield.sporting its colorful black, red, yellow, and green
                Like so many Britishstriped livery, executed a lengthy taxi roll on the
commercial projects, its momentum had beenconcrete runway flanked on either side by Hwange
abruptly arrested a little more than a year after itNational Park’s dry, brown grass and scrub
had been initiated.  Escalating fuel prices resultingexpanses, periodically interspersed by feeding herds
from the Arab-Israeli Yom Kippur War, changingof impalas.
economic conditions, and a general recession, coupled                Completing its “Before
with the pending nationalization of the UK aircraftTake Off” checklist, and extending its trailing
industry, had rendered the HS.146 programedge Fowler flaps to their 24-degree position, the
economically unfeasible by October of 1974.  As aaircraft throttled into its acceleration roll, its four
result, it had been halted, although small-scaleALF-502R-5 turbofans propelling its 35,500-kilo mass
engineering had continued and the aircraft’swith their 6,970 pounds of thrust into life-generating
drawings, tools, and jigs had been retained.speed.  Leveraging itself into rotation at 112 knots
                Three years later, on Marchwith its horizontal tail-hinged elevator, the BAe-146
15, 1977, British Aerospace had been formed with thesurrendered itself to the hot African atmosphere at a
merger of Hawker Siddeley and the British Aircraft118-knot V2 velocity, retracting its tricycle
Corporation, and the design, redesignated BAe-146,undercarriage and accelerating through a 171-knot
had been relaunched.  It had been the first to haveVFTO speed toward the gray, obscuring ceiling.
been undertaken by the new conglomerate the                Leaning into a right bank
following year, on July 10, 1978.over the brown and tan African expanse at 4,200
                Rolled out for the first timefeet, the BAe-146 retracted its flaps from the 24- to
three years later on May 20, 1981 at Hatfield, thethe 0-degree position, completing its “After Take
aircraft, registered G-SSSH, became the first newOff” checklist.  Ascending through 7,600 feet, at
British design since the BAC-111 had flown 18 yearswhich time a 291-knot ground speed had been
earlier.registered, it maintained a 1,800-fpm climb rate.  Its
                The aircraft, in its originalNAV indicated a 135.4-mile distance to Kariba.
BAe-146-100 form, featured a pressurized,                Plunging through the dirty
semi-monocoque, aluminum alloy/copper fuselageopaque obscurity at 15,780 feet, Fight 229 triumphed
whose inner fuselage frames bore the aircraft’sover white, mountainous-appearing cumulous, now
bending loads and whose outer, notched rings carriedunrestrictedly bulleting through the illustriously-blue
the sheer loads, a construction technique whichmid-afternoon purity at 18,640 feet.        
eliminated some 5,000 stringer/frame cleats.  Its                Inching the throttle back a
11.8-foot diameter, permitting five- or six-abreastmoment later, the British regional liner settled into its
coach seating, had ensured that passengers would21,000-foot level off plateau at a 354-knot ground
enjoy the same comfort on the type’s typicalspeed with 97.7 miles remaining to its destination.
feeder routes as that offered by wide body aircraft                Cabin service on the
operating long-range sectors to which they oftenone-hour domestic sector had included a selection of
transferred.sodas, mineral water, orange juice, and lemonade and
                Single-class capacity varieda snack try of potato chips and peanuts.
from 71 in a five-abreast, 33-inch configuration to 82                The ground speed had
at a six-abreast, 33-inch arrangement and an ultimatepinnacled at 411 knots.
93 at a six-abreast, 29-inch density.  Total capacity                Descent, initiated with 54
decreased with a forward, 12-seat, first class cabin inmiles remaining on its flight plan, had been attained by
a four-abreast configuration.dialing in 5,500 feet in the cockpit’s “ALT
                The aircraft had an 85-foot,SEL” autopilot, resulting in a 2,000-fpm descent
11½-inch overall length.rate.
                The wings, with an 86-foot                Surrendering once again to
span and 832-square-foot area, had featured athe dense, reference-losing obscurity of the cloud
15-degree sweepback and three degrees of anhedraldeck, the aircraft plunged through 10,000 feet at a
at their leading edges.  Due to the aircraft’s260-knot speed with 21 miles remaining to Kariba,
short, 150-nautical mile sectors, cruise speeds higherextending its petal air brakes at 7,000 feet, which
than its optimized Mach 0.7 had not been necessaryproduced a very controlled, but drag-induced profile. 
and had therefore obviated the need for greaterAn altitude of 4,500 feet had been intermittently
sweepback.  Low-speed, short-field performancedialed into the “ALT SEL” window.
had been attained by means of its single-section,                Emerging from the ceiling
tabbed, trailing edge Fowler flaps which, with amist over the baby blue of Lake Kariba, which had
210-square-foot area, had covered 78 percent of thebeen outlined by its dry, tan and brown scrub
span and had been hydraulically operated by Dowtyshoreline, the captain consulted his landing flap chart
Rotol actuators.  Roll control had been provided bycorresponding to a 34,500-kilo weight.
manually-operated, trim- and servo tab-equipped                Extending its Fowler flaps to
ailerons, which operated in conjunction with eachthe 18-degree position at 3,600 feet, at which time
outer wing’s hydraulically-actuated roll spoilers. 6.4 miles had remained on its flight plan, the airliner
Three additional inboard spoilers served as liftunleashed its undercarriage at a 162-knot ground
dumpers after touch down.speed and actuated its high-lift devices into the
                Power had been provided24-degree position while arcing into a left bank over
by four Textron Lycoming ALF-502R-5 turbofans,the parched expanse of desert.  Black mountain
each rated at 6,970 pounds of thrust, and these hadsilhouettes rolled into view ahead of the cockpit
replaced the lower-thrust, 6,700-pound ALF-502Hswindows.
originally intended for the design.  Avco Lycoming                Descending through 2,600
had since become “Textron Lycoming.”feet at a 161-knot ground speed, the BAe-146-200,
                A total of 3,098 US gallonsnow sporting 33 degrees of trailing edge flap,
of fuel could be carried in two wing integral and onemaintained a 270-degree heading, the runway,
center section tank, the latter located above theseemingly plowed between brown straw, visible
passenger cabin and equipped with a vented andthrough the windshield.
drained sealing diaphragm.  The single-point pressure                Extending its petal air brakes
fueling had been located on the right wing, outboardto the 60-degree position, the aircraft, at a negligible
of the number four engine.descent rate, passed over Runway 27’s
                The fixed horizontal tailplane,threshold at 120 knots, retarding its throttle and
mounted atop the vertical fin, had not required theflaring into main undercarriage contact with the
standard variable-incidence geometry because thesizzilingly hot concrete.  Decelerating with significant
absence of wing leading edge devices had eliminatedbrake applications, and with its spoiler handle already
the balance-out requirements ordinarily associateddeployed to the “LIFT SPLR” position, the
with the latter’s pitch changes.  Its location,thrust reverser-devoid quad-jet consumed the
avoiding wing downwash and engine thrustcenterline with its nose wheel until it had reached its
interference, provided the greatest moment-arm,other threshold and could execute a 180-degree turn.
thus reducing required area and weight.  Its               Taxiing toward the single
elevators had been manually operated, while theterminal’s ramp amid the sweltering, 94-degree
vertical fin’s rudder had been hydraulicallyheat, the high-wing, t-tailed airliner, although ordinarily
actuated.minuscule next to an intercontinental wide body,
                Key to the BAe-146 designdwarfed the United Air PA-23 Aztec and collection of
had been the 40-square-foot, hydraulically-actuatedprivate pistons now parked around it.
petal air brakes forming an integral, aerodynamic part                The BAe-146 had, as
of the tailcone at the extreme end of the fuselageevidenced by this sector, served as Zimbabwe’s
and deployable to a maximum 60-degree position. link between its often road-unconnected cities and
Augmenting slow, controlled, increased descent rates,communities.
they had enabled the aircraft to descend at 7,000 III
fpm above 10,000 feet and 4,000 fpm below it,                 Although the British
facilitating short-runway operation and eliminating theAerospace BAe-146 had only sold 219 examples of all
need for thrust reversers.of its versions to 45 world airlines, it had nevertheless
                The aircraft’sformed the basis of its later, more advanced,
hydraulically-operated, tricycle undercarriage had beenTextron Lycoming LF507-powered Avro RJ70, RJ85,
comprised of a steerable, telescope strut-attached,and RJ100 derivatives.