SDR SROM201311210001

Service difficulty report · Downlock Switch · Boeing 7377BD

Difficulty date: November 19, 2013
Submitted: November 21, 2013
Operation: Air carrier
Aircraft: N660CP
Make and model: Boeing 7377BD
Aircraft serial: 36721
Aircraft time: 5,904 hours, 4,645 cycles
System (JASC): 3260 · Landing Gear Position and Warning
Part: Downlock Switch
Part number: 189929
Part serial: 344028
Condition: Out Of Tolerance
Location: Mlg
Part time: 5,904 hours, 4,645 cycles
Stage of operation: CL
How discovered: O
Nature of condition: N
Precautionary procedure: A

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

What was found

DURING CLIMB OUT, AFTER GEAR RETRACTION, FORWARD PANEL GEAR INDICATOR SHOWED RT MAIN GEAR STILL DOWN AND LOCKED. OVERHEAD GEAR INDICATOR SHOWED ALL 3 GEAR UP AND LOCKED. RETURNED TO DEPARTURE. LANDED UNEVENTFUL. FOUND RT GEAR PRIMARY DOWN LOCK PROXIMITY SWITCH RESISTANCE OUT OF TOLERANCE. REPLACED SWITCH. GEAR SWING, OPS CHECK OK. SUBSEQUENT FLIGHTS OK.

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