Service difficulty report · Bleed Valve · Boeing 757232

Difficulty date
August 10, 2009
Submitted
August 18, 2009
Operation
Air carrier
Aircraft
N620DL
Make and model
Boeing 757232
Aircraft serial
22910
Aircraft time
70,368 hours, 34,509 cycles
Engine
Pwa PW2037
Engine time
64,954 hours, 31,143 cycles
Part
Bleed Valve
Part number
1B355801
Condition
Cracked
Location
Zone 600
Part time
64,954 hours, 31,143 cycles
Stage of operation
CL
How discovered
O
Nature of condition
M, J
Precautionary procedure
A

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

What was found

DURING CLIMB OUT THE NR 2 ENG EXCEEDED THE EGT LIMIT OF 657 DEG FOR 16 SEC THIS DID NOT OCCUR DURING A SURGE. ACFT RETURNED TO DEPARTURE WHERE IT LANDED WITHOUT INCIDENT. POST FLIGHT INSP WAS PERFORMED. THE 14TH STAGE BLEED VALVE WAS REMOVED AND REPLACED PN 5840207 SN 0573 NO HELP, REMOVED AND REPLACED THE 14TH STAGED BLEED VALVE CONVERTER PN 322895-18 SN 2233. NO HELP, REMOVED AND REPLACED 2.5 BLEED VALVE ACTUATOR PN 3830041-109 SN 0498, NO HELP. REMOVED AND REPLACED DAMAGED FUEL MANIFOLD PSI LINE ON 2.5 BLEED VALVE PN 183622-01, NSN. REMOVED AND REPLACED FUEL CONTROL UNIT PN 779100-5 SN A4327 NO HELP. PERFORMED BORESCOPE INSP OF COMBUSTION CHAMBER, HPT AND LPT SECTIONS WITH NO DEFECTS. PERFORMED BORESCOPE INSPECTION OF THE 6-17TH COMPRESSOR SECTION, NO DEFECTS NOTED. FOUND 14TH STAGE BLEED VALVE MUSCLE PRESSURE MANIFOLD LINE WAS CRACKED REMOVED AND REPAIRED LINE. PERFORMED ENGINE RUN AND OPS CHECKS GOOD. NO OTHER DEFECTS WERE NOTED. ACFT WAS RETURNED TO SERVICE.