Service difficulty report · Flap System · Boeing 7377H4

Difficulty date
June 29, 2026
Submitted
July 6, 2026
Operation
Air carrier
Aircraft
N221WN
Make and model
Boeing 7377H4
Aircraft serial
34259
Aircraft time
68,682 hours, 40,963 cycles
Part
Flap System
Condition
Locked
Stage of operation
AP
How discovered
O
Nature of condition
F
Precautionary procedure
O

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

What was found

TRAILING EDGE FLAP ASSYMETRY ON FLAP EXTENSION. RAN QRA FOR FLAP ASSYMETRY. ZERO FLAP LANDING. ALT FLAP USED FOR LEADING EDGE. AUTO BRAKE 3 USED. BRAKE COOLING 27.1 MILLION FT/LBS. UPON INVESTIGATION FOUND THAT HIGH ENERGY STOP WITH BRAKE COOLING OF 27.1 MILLION FT POUNDS TO BE WITHIN TIMED COOLDOWN PERIOD PER AMM 05-51-07-210-801 FIGURE 201 ACFT OK TO RETURN TO SERVICE. VERIFIED UPON INVESTIGATION FOUND THAT HIGH ENERGY STOP WITH BRAKE COOLING OF 27.1 MILLION FT POUNDS TO BE WITHIN TIMED COOLDOWN PERIOD IAW AMM 05-51-07-210-801 FIGURE 201 ACFT OK TO RETURN TO SERVICE.

More about the Boeing 737-7H4