Service difficulty report · Module · Boeing 737823

Difficulty date
November 24, 2025
Submitted
December 3, 2025
Operation
Air carrier
Aircraft
N862NN
Make and model
Boeing 737823
Aircraft serial
30905
Aircraft time
44,122 hours, 18,897 cycles
Part
Module
Part number
693733412
Part serial
F05890
Condition
Failed
Location
Zone 200
Part time
15,014 hours, 7,033 cycles
Stage of operation
CR
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

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LEVEL AT FL360 CABIN ALTITUDE LIGHT ILLUMINATED WITH A CABIN ALTITUDE HORN, ALSO AUTOPILOT DISCONNECTED. LIGHT STAYED ILLUMINATED UNTIL 10,000FT. MASKS DID NOT DEPLOY. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT LIT. R & R CABIN ALTITUDE WARNING SWITCHES S128 (AALA202511258692) AND S1153 (AALA202512026742), PER AMM 21-33-00-000-801. R & R CABIN ALTITUDE AND DIFFERENTIAL PRESSURE INDICATOR (AALA202512027046), PER AMM 21-33-02-400-801. REMOVE AND REPLACED CABIN RATE OF CLIMB INDICATOR (AALA202512023183), PER AMM 21-33-01-400-801. R & R CABIN ALTIMETER AND RATE OF CLIMB MODULE (AALA202512021304), PER AMM 21-33-07-400-801. ALL OPERATIONAL CHECK GOOD.