Service difficulty report · Test Switch · Boeing 737990ER

Difficulty date
April 4, 2026
Submitted
April 6, 2026
Operation
Air carrier
Aircraft
N472AS
Make and model
Boeing 737990ER
Aircraft serial
60580
Aircraft time
41,134 hours, 12,596 cycles
Part
Test Switch
Condition
Dirty
Location
Zone 100
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

WHEEL WELL FIRE TEST FAILED SWITCH IN WHELL WELL DOES NOT EXTINGUISH LIGHT OR BELL. GROUNDED - YES. TRANSFERED TO MIG-5 S/N OK464651 CLEANED WHEEL WELL FIRE TEST SWITCH OPS CHECK GOOD IAW B737-900 AMM 26-15-00-710-801 AND 20-60-02-100-801.