Service difficulty report · Pump · Boeing 737824

Difficulty date
December 6, 2025
Submitted
December 9, 2025
Operation
Air carrier
Aircraft
N79521
Make and model
Boeing 737824
Aircraft serial
31662
Aircraft time
47,782 hours, 17,074 cycles
Engine
Cfmint CFM567B263
Part
Pump
Part number
82830011
Part serial
YA057586C
Condition
Faulty
Location
Fuel Sys
Part time
29,477 hours, 10,841 cycles
Stage of operation
TO
How discovered
O
Nature of condition
J
Precautionary procedure
C

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

What was found

NUMBER 1 ENGINE N1 WOULD NOT INCREASE PAST 90. PERFORMED HIGH POWER ENGINES AT MAX POWER ENGINE 1 N1 - 91.5, FF - 8.60, EGT -769. ENGINE 2 N1 - 97.5 , FF - 10.69, EGT - 834. PERFORMED FIM TASK 73-05 TASK 808. PER STEPE(2)(B) WE HAVE A VALUE OF REGULATOR 3. CONTINUED WITH FIM 73-05 TASK 808. PERFORMED THRUST LEVER ANGLE RESOLVER ALIGNMENT TEST. AMM 73-21-00-700-807-F00. ALL PARAMETERS WITHIN LIMITS. NEED TO CONTINUE AND PERFORM STEP 6(A) VISUAL INSPECTION OF THE IMPELLER ROTATION (AMM 73-11-01-200-801-F00). ONLY REMOVED E1 HMU IAW AMM 73-21-10/401 STILL REQUIRES INSTALLATION. ADD EMP:U439706,U439285 ONLY REMOVED E1 FUEL PUMP IAW AMM 73-11-11-401 STILL REQUIRES INSTALLATION. INSTALLED ENG 1 HUM IAW AMM TASK 73-21-10.