Service difficulty report · Outflow Valve · Boeing 737301

Difficulty date
May 26, 2003
Submitted
June 16, 2003
Operation
Air carrier
Aircraft
N573US
Make and model
Boeing 737301
Aircraft serial
23560
Part
Outflow Valve
Part number
322684003
Condition
Leaking
Location
E/E Bay
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
B

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

What was found

EN ROUTE FROM MCI TO CLT, AT FL290, THE CABIN BEGAN CLIMBING AT OVER 1,000 FEET PER MINUTE. BLEED PRESSURE WAS NORMAL AND THE OUTFLOW VALVE WAS CLOSED. CABIN STABILIZED ONCE AIRCRAFT DESCENDED TO FL240. FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT AT CLT. MAINTENANCE FOUND AIR LEAKS AT THE FORWARD OUTFLOW VALVE, E/E COMPARTMENT DOOR AND APU DUCT PRESSURE SEAL AT AFT BULKHEAD. REPLACED FORWARD OUTFLOW VALVE PER MM 21-43-11. OPERATIONAL CHECK NORMAL. REPLACED PRESSURE SEAL FOR APU BLEED DUCT. LEAK CHECK GOOD. FOUND SEAL ROLLED ON E/E COMPARTMENT DOOR. REPOSITIONED SEAL. PERFORMED LEK RATE CHECK PER MM 05-51-01. LEAK CHECKS WITHIN LIMITS. (M)