What was found
LOUD BANG FOLLOWED BY RAPID RISE IN CABIN ALTITUDE WITH "CABIN ALT" EICAS MESSAGE. FOUND NR 1 PACK DUMP VALVE AT FAULT. DEACTIVATED VALVE IN CLOSED POSITION. TRANSFERRED TO MEL M08-058 REF MEL 21-51-10 CAT C.
- Difficulty date
- May 5, 2008
- Submitted
- May 15, 2008
- Operation
- Air carrier
- Aircraft
- N499MC
- Make and model
- Boeing 74747UF
- Aircraft serial
- 29260
- Aircraft time
- 34,536 hours, 5,945 cycles
- System (JASC)
- 2150 · Cabin Cooling System
- Part
- Dump Valve
- Part number
- 32049581
- Part serial
- 186
- Condition
- Failed
- Location
- Nr 1 Pack
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- I, G, B, A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.