Service difficulty report · Fire Detector · Boeing 7878

Difficulty date
April 26, 2025
Submitted
April 30, 2025
Operation
Air carrier
Aircraft
N799AV
Make and model
Boeing 7878
Aircraft serial
34796
Aircraft time
33,384 hours, 4,122 cycles
Engine
Rroyce TRENT1000A
Engine time
24,179 hours, 3,030 cycles
Part
Fire Detector
Part number
47444454744448
Part serial
ACT7423ACT743
Condition
False Activation
Location
Lt Engine
Part time
24,179 cycles
Stage of operation
CL
How discovered
V
Nature of condition
N
Precautionary procedure
A

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

What was found

DURING INITIAL CLIMB OVERHEAT ENG L ON EICAS. ENG CONTROL L ON STATUS AND AFTER LANDING ON EICAS. IAW AMM DMC-B787-A-R71-00-00-06A-950A-A NACELLE OVERHEAT WARNING INSPECTIONS WERE PERFORMED. BY MM 75-97671 FIM DMC-B787-A-R75-10-F1-09A-421A-A STEP 1.B.(1) FOLLOWING CMCF MAINTENANCE MESSAGES WERE FOUND 73-92661, 73-92721. ACCORDING WITH FIM STEP 1.B.(1)(A).2 DURING THE INSPECTION THE HP6 SERVO AIR TUBE PN KH10897 WAS FOUND WITH A J-BLADE IN BAD STATE. IT WAS REPLACED IAW AMM DMC-B787-A-R70-12-06-00A-520A-A/720A-A CMCF ESS ANTI-ICE SYSTEN TEST WAS SUSSESSFULLY PERFORMED IAW DMC B787-A-R71-00-00-35B-300-A. MM 73-92661 FIM DMC-B787-A-R75-30-F3-24A-421A-A STEP 1.B.(1) DETAILED INSPECTION OF THE RIGHT SOLENOID BANK WAS PERFORMED IAW AMM DMC-B787-A-R75-33-18-05A-280B-A IT WAS FOUND WITH COVER PLATE DISCOLORATION YELLOW/STRAW. IT WAS REPLACED IAW AMM DMC-B787-A-R75-33-18-01A-520A-A/720A-A CMCF HANDLING BLEED VALVE SYSTEM TEST WAS SUCCESSFULLY PERFORMED IAW DMC-B787-A-R73-00-00-35B-300-B-A BY MM 26-10121 DMC-B787-A-26-10-F1-02A-421A-A LEFT AND RIGHT ENGINE FIRE DETECTOR ASSEMBLIES ZONE 2 WERE REPLACED IAW AMM DMC-B787-A-26-11-02-01C-520A-A/720A-A

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