Service difficulty report · Proximity Switch · Boeing 737824

Difficulty date
February 6, 2026
Submitted
February 10, 2026
Operation
Air carrier
Aircraft
N76519
Make and model
Boeing 737824
Aircraft serial
30132
Aircraft time
48,398 hours, 17,472 cycles
Part
Proximity Switch
Part number
285A16006
Part serial
F04545
Condition
Faulted
Location
Zone 700
Part time
39,163 hours, 14,861 cycles
Stage of operation
CL
How discovered
O
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

NOSE GEAR DOOR LIGHT SHOWS RED WHEN GEAR HANDLE IN OFF POSITION, NOSE GEAR GRAVITY DROP. IAW FLT CREW, NOSE GEAR DISAGREE, GEAR COMES UP WITH HANDLE IN UP POSITION. WHEN HANDLE SELECTED OFF, NOSE GEAR DROPS. HANDLE SELECTED DOWN ALL GEAR SHOWS DOWN & LOCKED. VERIFIED NLG IS DOWN & LOCKED. CREW STATED, IT APPEARS NLG NEVER REACHED UP & LOCKED POSITION. PSEU INTERROGATION AGREES WITH SAME CONCLUSION AS NO CURRENT FAULTS FOUND & NOTHING IN HISTORY FOR LAST LEG. INSP OF NLG ASSY REVEALED NO OBVIOUS FAULTS OR DEFECTS. NLG SHOWING CHROME, SO STRUT IS NOT FLAT. NLG STEERING DOES NOT APPEAR TO BE BYPASSING & TURNING UNDER NORMAL SYS PRESSURE. ACFT NOW IN IAH OOS. CHKD PSEU POWER INPUT IAW FIM 32-09 TASK 822. FOUND C/B PSEU D2, P6-3 & DC BATTERY BUSS C/B CLOSE AT TIME OF FERRY FLT, LANDING AT IAH. CHKD FOR POWER AT PSEU UNIT, D11140, PIN 41. 28V DC PRESENT. CHKD FOR GROUND AT PIN 61, FOUND GROUND WITH IN NORMAL RANGE. R & R PSEU IAW AMM 32-09-10/401, TEST PASSED. NLG DOOR LIGHT STILL SHOWS RED UPON SWING, NO FIX. THE NOSE GEAR MANUAL EXTENSION RELEASE MECHANISM WAS FOUND TO BE THE ISSUE & REPLACED. REF LOGPAGE #7857089. NLG LIGHT NOW IN AGREEMENT WITH HANDLE POSITION.