Service difficulty report · Downlock Sensor · Boeing 737301

Difficulty date
October 31, 2011
Submitted
November 1, 2011
Operation
Air carrier
Aircraft
N574US
Make and model
Boeing 737301
Aircraft serial
23739
Aircraft time
64,786 hours, 46,358 cycles
Part
Downlock Sensor
Part number
189929
Condition
Faulty
Location
Nlg
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

DURING CRUISE, EN ROUTE FROM BDL TO CLT, CREW REPORTED THE NOSE LANDING GEAR RED INDICATOR LIGHT ILLUMINATED. ON GEAR EXTENSION, ALL GEAR INDICATIONS WERE NORMAL. ON LANDING AND ROLL OUT, GEAR INDICATIONS WERE ALSO NORMAL. AN EMERGENCY WAS DECLARED AS A PRECAUTION. MAINTENANCE REPLACED THE NOSE LANDING GEAR DOWNLOCK SENSOR S845 IAW 32-61-51 FOR INTERMITTENT NEAR STATE FAULT. ALSO, REPLACED NOSE LANDING GEAR UPLOCK SENSOR S846 IAW 32-61-41 FOR CONDITION. PERFORMED SATISFACTORY NLG RETRACTION AND EXTENSION TEST. NORMAL OPERATION AND INDICATION.