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19950129005649I

Incident · Minor damage
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FAA incident report · Piper PA31310 · Teterboro, NJ · January 29, 1995

FAA Aviation Safety Information Portal

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Date
January 29, 1995 · 09:54 local
Place
Teterboro, NJ
Airport
Teterboro
Phase of flight
Roll-Out (Fixed Wing)
Operating rules
General operating rules (Part 91)
Damage
Minor damage
Aircraft
N9230Y
Reported as
Piper PA31310
People aboard
2
Fatal injuries
0
Pilot’s flight hours
11,000 total15 in this make and model

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Narrative: after landing runway 01 at teb airport and decelerating, the left main landing gear collapsed and the aircraft veered to the left, went off the runway, and came to a stop on the grassy area. Impact damage to the left wing tip, lower wing surface, left aileron, left trailing edge flap, left wheel well gear door, and left engine propeller blades were sustained. On March 1, 1995, a landing gear system functional check was conducted. It consisted of an anti-retraction system check and gear retraction and extension. The anti-retraction check was found operational. However, the retraction and extension check showed that the left gear operated normally in the down and lock position but abnormally in the up and lock position. This was due to binding of the uplock hook mechanism resulting from dirt, corrosion and lack of lubrication. This contaminated condition was also evident in the downlock mechanism, the left gear down lock indication switch (for green light) was found out of adjustment allowing the indication light to stay green even though the gear may not be down and locked. As a result of this probability and the degraded condition of the landing gear locking mechanisms, the possibility existed that the left gear may not have been down and locked at the time of the incident. Therefore, this office considers this incident closed.

As the FAA filed it

NARRATIVE: AFTER LANDING RUNWAY 01 AT TEB AIRPORT AND DECELERATING, THE LEFT MAIN LANDING GEAR COLLAPSED AND THE AIRCRAFT VEERED TO THE LEFT, WENT OFF THE RUNWAY, AND CAME TO A STOP ON THE GRASSY AREA. IMPACT DAMAGE TO THE LEFT WING TIP, LOWER WING SURFACE, LEFT AILERON, LEFT TRAILING EDGE FLAP, LEFT WHEEL WELL GEAR DOOR, AND LEFT ENGINE PROPELLER BLADES WERE SUSTAINED. ON MARCH 1, 1995, A LANDING GEAR SYSTEM FUNCTIONAL CHECK WAS CONDUCTED. IT CONSISTED OF AN ANTI-RETRACTION SYSTEM CHECK AND GEAR RETRACTION AND EXTENSION. THE ANTI-RETRACTION CHECK WAS FOUND OPERATIONAL. HOWEVER, THE RETRACTION AND EXTENSION CHECK SHOWED THAT THE LEFT GEAR OPERATED NORMALLY IN THE DOWN AND LOCK POSITION BUT ABNORMALLY IN THE UP AND LOCK POSITION. THIS WAS DUE TO BINDING OF THE UPLOCK HOOK MECHANISM RESULTING FROM DIRT, CORROSION AND LACK OF LUBRICATION. THIS CONTAMINATED CONDITION WAS ALSO EVIDENT IN THE DOWNLOCK MECHANISM, THE LEFT GEAR DOWN LOCK INDICATION SWITCH (FOR GREEN LIGHT) WAS FOUND OUT OF ADJUSTMENT ALLOWING THE INDICATION LIGHT TO STAY GREEN EVEN THOUGH THE GEAR MAY NOT BE DOWN AND LOCKED. AS A RESULT OF THIS PROBABILITY AND THE DEGRADED CONDITION OF THE LANDING GEAR LOCKING MECHANISMS, THE POSSIBILITY EXISTED THAT THE LEFT GEAR MAY NOT HAVE BEEN DOWN AND LOCKED AT THE TIME OF THE INCIDENT. THEREFORE, THIS OFFICE CONSIDERS THIS INCIDENT CLOSED.