NTSB Identification: FTW85FQG02.
The docket is stored on NTSB microfiche number 31515.
Accident occurred Friday, August 23, 1985 in BIG SPRING, TX
Aircraft: PIPER PA-28-140, registration: N7401R
Injuries: 2 Uninjured.

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.

THE ACFT COCKPIT/CABIN FILLED WITH SMOKE AFTER TAKEOFF. THE PLT & PASSG SMELLED AN ODOR OF ELECTRICAL WIRING BURNING AND SAW FIRE AT THE FIREWALL NEAR THE RUDDER PEDALS. THE ACFT WAS TURNED 180 DEGREES AND LANDED ON RWY 35. THE 2 OCCUPANTS IMMEDIATELY EGRESSED. INVESTIGATION SHOWED THAT THE ENG LEFT EXHAUST STACK, PN 63726-O2, WHICH SHOULD BE INSERTED INTO THE MUFFLER ASSEM, PN 66704-00 AND SECURED WITH CLAMP ASSEM, PN 65442-03 WAS DISPLACED AWAY FROM THE END OF THE MUFFLER ALLOWING HOT GASES TO BE DIRECTED ONTO THE FIREWALL IN THE AREA OF THE STARTER SOLENOID AND BRAKE RESERVOIR. THE SECURING CLAMP ASSEM WAS PRESENT ON THE MUFFLER WITH THE NUT INSTALLED AND CLAMP FLUSH WITH THE OUTSIDE DIAMETER OF THE MUFFLER EXTENSION. THE LOCATER PIN WAS EXTENDING THRU THE MUFFLER EXTENSION. THE EXHAUST STACK HAD THE LOCATOR HOLD AND INSPECTION DID NOT SHOW THAT THE PIN WAS WORN OR SHEARED TO ALLOW DISENGAGEMENT. FIRE DAMAGED THE ACFT FROM THE FIREWALL TO THE BAGGAGE/REAR AERA. FLUID FROM THE MELTED BRAKE RESERVOIR APPEARED TO ADD TO THE FIRE.

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

EXHAUST SYSTEM,MUFFLER..DISCONNECTED

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

EXHAUST SYSTEM,STACK..NOT ENGAGED

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