SDR 99UAL900523

Service difficulty report · Circuit Card · Boeing 737522

Difficulty date: October 13, 1999
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N941UA
Make and model: Boeing 737522
Aircraft serial: 26676
Engine: Ge CFM56*
System (JASC): 3230 · Landing Gear Retraction/Extension System
Part: Circuit Card
Condition: Failed
Location: Landing Gear
Component: 2899111
Stage of operation: CL
Nature of condition: J
Precautionary procedure: A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LANDING GEAR EXTENSION WAS NORMAL, BUT RETRACTION REQUIRED LOCK OVERRIDE. THE FLIGHT CREW CYCLED THE LANDING GEAR CIRCUIT BREAKER, BUT NO RESPONSE FROM THE LANDING GEAR. *S/D* REPLACED THE GROUND SENSING SQUAT SWITCH CIRCUIT CARD, M990. CONDUCTED OPERATIONAL CHECKS ON THE LANDING GEAR, ALL CHECKS NORMAL.