NTSB Identification: FTW85FA112.
The docket is stored on NTSB microfiche number 28487.
Scheduled 14 CFR
Accident occurred Wednesday, February 06, 1985 in ALTUS, OK
Aircraft: CESSNA 402B, registration: N5780M
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING AN ENG START, PRIOR TO THE FLT, THE L ENG BACKFIRED 2 OR 3 TIMES. A WITNESS DESCRIBED THE 1ST BACKFIRED AS 'THE LOUDEST I HAVE EVER HEARD.' WHEN THE ACFT TOOK OFF, TWO PERSONS LIVING NEAR THE DEPARTURE END OF THE RWY NOTED THAT THE ACFT (BELIEVED TO BE THE SAME) SOUNDED DIFFERENT & HAD A 'CLUTTERING SOUND. 'WHILE CLIMBING, THE PLT DECLARED AN EMERGENCY & REPORTED A FIRE IN THE L ENG. HE WAS VECTORED TOWARD ALTUS AFB WHILE DSCNDG IN IFR CONDITIONS. HE DSCNDD INTO VFR CONDITIONS & SAW THE ARPT ABOUT 3 MI AWAY. A WITNESS SAW SMOKE & FIRE TRAILING FROM THE VICINITY OF THE L ENG. HE STATED THAT THE ACFT'S NOSE CAME UP, THE PLANE ROLLED TO THE LEFT, THEN IT ENTERED A STEEP, NOSE DOWN, INVERTED ATTITUDE JUST BEFORE IT CRASHED & BURNED. AN EXAM REVEALED THE ENG EXHAUST MAINIFOLD HEADER ASSY HAD FAILED & ALLOWED HOT EXHAUST GASES TO ESCAPE IN THE ENG NACELLE IN THE VICINITY OF FUEL & OIL LINES. CORROSION HAD PROGRESSED THRU THE HEADER ASSY. AD 75-23-08 REQD GEN INSPN, BUT CONTAINED NOTE 'DO NOT REMOVE CLAMPS.' NO RECORD OF REPLACEMENT IN 6100 HRS

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

EXHAUST SYSTEM,MANIFOLD/PIPE..CORRODED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MISCELLANEOUS..FIRE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

REASON FOR OCCURRENCE UNDETERMINED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,INSPECTION..INADEQUATE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

EXHAUST SYSTEM,MANIFOLD/PIPE..FAILURE,TOTAL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

EXHAUST SYSTEM,MANIFOLD/PIPE..LEAK


Contributing Factors

WEATHER CONDITION..CLOUDS



Contributing Factors

PROCEDURE INADEQUATE..MANUFACTURER


Contributing Factors

INADEQUATE SURVEILLANCE OF OPERATION..FAA(ORGANIZATION)


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