un 737 Sud Africain perd un réacteur au décollage

[flyrelax]

Ce 737 a effectivement perdu par séparation le moteur droit au complet et non le seul reverser.... c'est un accident rarissime sur 737 et son issue heureuse est un exemple d'un parfait travail de l'équipage :

quelques photos ''collector'' de ZS-OEZ (so easy !)

et sa fiche

http://www.airfleets.net/ficheapp/plane-b737-22118.htm

[flyrelax]

sur PPRune, liste des cas comparables :

Delta B737-200 7Jan92 DFW. Engine separation on takeoff. After T/O at 200' breakaway safety bolts called "Cone Pins" sheared for right engine. Engine bounced on grass on right side of runway.
http://www.ntsb.gov/ntsb/brief.asp?e...11X13985&key=1
... FTW92IA055 ....
... DELTA AIR LINES ...
... Tuesday, January 07, 1992 in DFW ...
... BOEING 737-232 ... N322DL ...

THE RIGHT ENGINE SEPARATED ... CLIMBING THROUGH 200 FEET AFTER TAKEOFF. ... UNEVENTFUL LANDING ...

ENGINE SEPARATION WAS THE RESULT OF THE FAILURE OF THE AFT CONE BOLT AND THE ENGINE SECONDARY SUPPORT ASSEMBLY. THE AFT CONE BOLT FAILED AS RESULT OF A PREEXISTING FATIGUE CRACK, WHILE THE ENGINE SECONDARY SUPPORT ASSEMBLY FAILED AS RESULT OF THE DYNAMIC LOADS THAT EXCEEDED THE DESIGNED CAPACITY OF THE MOUNTING BOLTS.

THE TWO FORWARD CONE BOLTS FAILED IN OVERLOAD AS THE ENGINE SWUNG FORWARD DURING THE SEPARATION SEQUENCE.

METALLURGICAL TESTING REVEALED THAT THE FATIGUE OF THE AFT CONE BOLT WAS A RESULT OF LUBRICANT INADVERTENTLY INTRODUCED INTO THE CONICAL SURFACE OF THE CONE BOLT.

...Board determines the probable cause ...
THE FAILURE OF THE AFT CONE BOLT AS RESULT OF PREEXISTING FATIGUE CRACKING DUE TO IMPROPER MAINTENANCE, AND THE FAILURE OF THE SECONDARY SUPPORT STRUCTURE AS A RESULT OF LOADS THAT EXCEEDED THE CAPACITY OF THE ATTACHING HARDWARE AND THE CRUSHABLE HONEYCOMB CORE.

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Piedmont Airlines B737-200, 20Jan89, right engine separated from aircraft after T/O at Chicago. Newly designed secondary support structure had not yet been installed.
http://www.ntsb.gov/ntsb/brief.asp?e...13X27558&key=1
... CHI89MA046 ....
... PIEDMONT AIRLINES
... Friday, January 20, 1989 in CHICAGO, IL ...
... BOEING 737-201 ... N242US ...

AN IN-FLIGHT TEARAWAY OF THE RIGHT ENGINE (FROM THE RIGHT WING) OCCURRED AS THE AIRPLANE LIFTED OFF FROM THE RUNWAY. ... CONTINUED THE TAKEOFF ... RETURNED ...

AN EXAM OF ITS WING & SEPARATED ENGINE REVEALED THE AFT CONE (ENG MOUNTING) BOLT HAD FAILED FROM FATIGUE, THEN THE TWO FORWARD CONE BOLTS FAILED FROM DUCTILE OVERSTRESS.

A RAISED MECHANICAL DEFORMATIVE WAS FOUND ON THE CONICAL SURFACE OF THE AFT BOLT. THE DEFORMITY WAS INDICATIVE OF DAMAGE PRODUCED PRIOR TO OR DURING ASSEMBLY OF THE CONE BOLT IN THE ISOLATION MOUNT. A MATCHING CAVITY WAS NOTED ON THE ISOLATION MOUNT. THERE WAS EVIDENCE THAT THE MECHANICAL IRREGULARITY RESULTED IN A NONUNIFORM FIT WHICH ALLOWED THE TORQUED FITTING TO LOOSEN DURING CYCLIC LOADING.

AD 88-01-07 REQUIRED THAT ULTRASONIC INSPECTION OF THE CONE BOLTS BE PERFORMED AT INTERVALS NOT TO EXCEED 600 CYCLES. AN ULTRASONIC INSPECTION OF THE BOLTS HAD BEEN ACCOMPLISHED ABOUT 330 CYCLES BEFORE THE ENGINE SEPARATED.

... Board determines the probable cause ...
PREVIOUS DAMAGE TO THE AFT CONE (ENGINE MOUNTING) BOLT, WHICH RESULTED IN MISMATCHED SURFACES BETWEEN THE BOLT AND ISOLATION MOUNT, LOSS OF TORQUE DURING CYCLIC LOADING OF THE MOUNTING BOLT, AND SUBSEQUENT FATIGUE FAILURE OF THE BOLT.

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US Air B737-200 PHL 5Dec87 #2 engine separated shortly after takeoff. Cracks caused by metal fatigue in one of three bolts; after rear bolt failed the two forward bolts and support cable failed in overload. http://www.ntsb.gov/ntsb/brief.asp?e...13X32769&key=1
... NYC88FA050 ....
... USAIR
... Saturday, December 05, 1987 ... DEPTFORD, NJ ...
... BOEING 737-2B7 ... N319AU ...

DRG TKOF, AS USAIR FLT 224 WAS CLBG THRU 4000', THE ACFT YAWED/ROLLED RGT. SIMULTANEOUSLY, THE CREW NOTICED THE #2 THROTTLE SLAM/LOCK TO THE IDLE PSN & A CONTINUOUS AIRFRAME BUFFET BEGAN.

SOON THEREAFTER, THE #2 ENG SEPD FM THE ACFT & THE BUFFET STOPPED.

THE ENG IMPACTED IN AN OPEN FLD, 6 MI FM THE ARPT.

JUST BFR IT SEPD, A PAX SAW THE AFT END OF THE #2 ENG MOMENTARILY DROOP ABOUT 30 DEG.

AFTER ENG SEPN, THE 'B' HYD SYS LOST PRES & THE TE FLAPS WOULD ONLY EXTD 10 DEG.

THE ACFT WAS LNDD SAFELY AFTER AN EMERG GEAR EXTN & DIFFERENTIAL BRAKING WAS USED FOR STEERING.

AN EXAM REVEALED THE AFT MOUNT CONE BOLT FOR THE #2 ENG HAD FAILED FM FATIGUE THRU THE THREAD RELIEF UNDERCUT RADIUS. FATIGUE CRACKS HAD INITIATED ON DIAMETRICALLY OPPOSITE SIDES OF THE RADIUS. SUBSEQUENTLY, THE FWD MOUNT CONE BOLTS & SECONDARY SUPPORT CABLE FAILED FROM OVERLOAD.

... Board determines the probable cause ...
ENGINE INSTALLATION, MOUNTING BOLT ..FATIGUE

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"Southwest 223" / 3Jan86 B737-2H4, after T/O from Love Field (Dallas), Rt Engine rear mount Cone Bolt sheared, mount failed and restraining cable broke; leaving the engine attached by only the two fwd mount bolts; returned safely. [AWST 124:31 Ja 13'86, photo.]

http://www.ntsb.gov/ntsb/brief.asp?e...10X00187&key=1
... FTW86MA030
... SOUTHWEST ...
... January 03, 1986 in DALLAS, TX
... BOEING 737-2H4 ... N86SW ...

THIS INCIDENT OCCURRED WHEN THE NO. 2 ENGINE EXPERIENCED AN AFT ENGINE MOUNT CONE BOLT FAILURE AND THE SUBSEQUENT FAILURE OF THE SECONDARY SUPPORT LINK (STAINLESS STEEL CABLE).

THE FAILURE OF BOTH AFT ENGINE SUPPORT ASSEMBLIES DURING THE TAKEOFF ROLL ALLOWED THE AFT SECTION OF THE ENG TO HANG DOWN TO WITHIN 4' [sic, transcription err] OF THE GROUND. AS A RESULT, THE NO.2 THRUST REVERSER ACTUATOR ASSEMBLY DRUG THE RUNWAY ON ROTATION.
... RETURNED ... LANDED...

METALLURGICAL EXAMINATION OF THE CONE BOLT REVEALED THAT IT FAILED AS A RESULT OF FATIGUE, MOST PROBABLY DUE TO IMPROPER INSTALLATION OF THE BOLT, SPECIFICALLY, THAT IT WAS UNDER TORQUED WHEN THE OPERATOR RE-INSTALLED THE ENG.

THE SAFETY CABLE FAILED AS A RESULT OF OVERSTRESS, PROBABLY INDUCED WHEN THE ACFT ENCOUNTERED A ROUGH STRETCH OF RUNWAY DURING THE TAKEOFF ROLL.

... Board determines the probable cause ...
ENGINE INSTALLATION, SUSPENSION MOUNTS .. FAILURE, PARTIAL
... FATIGUE ... SEPARATION ... OVERLOAD ... UNDERTORQUED
MAINTENANCE, INSTALLATION .. IMPROPER ...

Contributing Factors ... RUNWAY / LANDING AREA CONDITION ... ROUGH /UNEVEN

[opslady]

Et un autre, dont on parle toujours sur les forums..celui que j'ai vu de loin, en route au boulot, jeune agente AF..c'etait un jour inoubliable pour moi..25May 1979.
La fumee noire vue depuis ma voiture sur l'autoroute, suite au crash du DC10, vol AA191 , le moteur 1 detache, tombe.
Je ne savais pas ce que c'etait..et puis j'ai mis la radio..

"In the cockpit and cabin, the takeoff roll seemed totally normal. The view from the cockpit was even being broadcast on the airliner's closed circuit television system for the passengers' enjoyment. But six thousand feet into the takeoff roll, air traffic controllers in O'Hare's control tower saw small parts of the aircraft's no.1 engine pylon fall away, and as the aircraft started its rotation, the entire number one engine separated from the wing.

Behaving exactly as it was designed to, the severed engine flew up and over the left wing, falling to the runway below. Unfortunately, in the process, it ripped out all of the hydraulic lines to the leading edge slats. As a result, pressure slowly started to leak out and the leading edge slats slowly started to retract..."

La suite: AA191

[MD11]

Pour l'accident du vol AA191, c'était un pb de maintenace du moteur si je me souviens bien. Ca a du être impressionant de voir ça en live

[froggy]

Une reconstitution ICI

Je n'avais jamais entendu parler de cet accident...

[opslady]

Je pensais que tout le monde en etait au courant, que je repetais des choses deja bien connues..mci pour le lien, Frogman.

On a fait du hangar de AA une morgue temporaire.
Ce jour, ma collegue etait tellement traumatisee qu'elle est partie.

Un effet secondaire--on a passe des mois et des mois a rerouter des passagers en correspondance sur un DC-10, l'avion ayant ete plante suite a cet accident incroyable.

MD-11, tu as tout a fait raison.