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19960906026279I

Incident · Minor damage
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FAA incident report · Cessna 525 · El Monte, CA · September 6, 1996

FAA Aviation Safety Information Portal

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Date
September 6, 1996 · 09:00 local
Place
El Monte, CA
Phase of flight
Roll-Out (Fixed Wing)
Operating rules
General operating rules (Part 91)
Damage
Minor damage
Aircraft
N106CJ
Reported as
Cessna 525
People aboard
2
Fatal injuries
0
N106CJRegistered now · Cessna 525S/N 525-0006 · Built 1993Airframe modelCessna 525Engine modelWilliams FJ-44 seriesTurbo-fan

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: on sept. 06, 1996, at approx. 0900L, at El Monte airport, CA. A Cessna citation jet T25-006, N106CJ, sustained minor damage, when the left main landing gear (lmlg) collapsed after landing on rwy 19. Investigation revealed the lmlg rear support trunnion bearing appears to have frozen in place, causing the aft trunnion pin to sever the roll pin. With the roll pin severed, this resulted in the trunnion pin migrating out of the trunnion bearing and causing the collapse of the lmlg. The left wing extended flap assembly prevented the outboard wing from contacting the ground. Damage was isolated to the left center wing bond panel skins, the lmlg, and the left flap. Within 6 days of this incident, Cessna has issued a mandatory service letter alert 525-32-11 that provides instructions for inspections of the MLG roll pins to ensure the trunnion pins have not migrated fwd or aft of the trunnion support bearings. Also service bulletin 525-32-08 was issued for replacement of the existing MLG trunnion bearings with new self-lubricating bearings which are sealed. This office considers this incident closed.

As the FAA filed it

NARRATIVE: ON SEPT. 06, 1996, AT APPROX. 0900L, AT EL MONTE AIRPORT, CA. A CESSNA CITATION JET T25-006, N106CJ, SUSTAINED MINOR DAMAGE, WHEN THE LEFT MAIN LANDING GEAR (LMLG) COLLAPSED AFTER LANDING ON RWY 19. INVESTIGATION REVEALED THE LMLG REAR SUPPORT TRUNNION BEARING APPEARS TO HAVE FROZEN IN PLACE, CAUSING THE AFT TRUNNION PIN TO SEVER THE ROLL PIN. WITH THE ROLL PIN SEVERED, THIS RESULTED IN THE TRUNNION PIN MIGRATING OUT OF THE TRUNNION BEARING AND CAUSING THE COLLAPSE OF THE LMLG. THE LEFT WING EXTENDED FLAP ASSEMBLY PREVENTED THE OUTBOARD WING FROM CONTACTING THE GROUND. DAMAGE WAS ISOLATED TO THE LEFT CENTER WING BOND PANEL SKINS, THE LMLG, AND THE LEFT FLAP. WITHIN 6 DAYS OF THIS INCIDENT, CESSNA HAS ISSUED A MANDATORY SERVICE LETTER ALERT 525-32-11 THAT PROVIDES INSTRUCTIONS FOR INSPECTIONS OF THE MLG ROLL PINS TO ENSURE THE TRUNNION PINS HAVE NOT MIGRATED FWD OR AFT OF THE TRUNNION SUPPORT BEARINGS. ALSO SERVICE BULLETIN 525-32-08 WAS ISSUED FOR REPLACEMENT OF THE EXISTING MLG TRUNNION BEARINGS WITH NEW SELF-LUBRICATING BEARINGS WHICH ARE SEALED. THIS OFFICE CONSIDERS THIS INCIDENT CLOSED.