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SDR AALA202305119633

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Service difficulty report · Hmu · Boeing 737823

FAA SDR system

Difficulty date
May 1, 2023
Submitted
May 11, 2023
Operation
Air carrier
Aircraft
N957NN
Make and model
Boeing 737823
Aircraft serial
31202
Aircraft time
25,720 hours, 10,366 cycles
Engine
Cfmint CFM567B20
Engine time
59,663 hours, 25,010 cycles
System (JASC)
7321 · Fuel Control/Turbine Engines
Part
Hmu
Part number
1853M56P16
Part serial
BECWC149
Condition
Unserviceable
Location
Zone 300 - Stabs
Part time
25,720 hours, 10,366 cycles
Stage of operation
TO
How discovered
V
Nature of condition
O
Precautionary procedure
C

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

What was found

AIRCRAFT WAS GROUNDED: ON TAKEOFF THE NUMBER 1 ENGINE DID NOT DEVELOP FULL TAKEOFF THRUST AT 26 K MAX. NUMBER 1 SHOWED 98.7 SHOULD HAVE BEEN 100.7 N1 LOW SPEED REJECT AT 75 KNOTS. **SUPPLEMENTAL REPORT FOR AALA202305047739: REPLACED ENGINE 1 FUEL PUMP PER AMM 73-11-11 (AALA202305047739), HYDROMECHANICAL UNIT PER JOB CARD 08L40073001 (AALA202305119633), AND SERVO FUEL HEATER PER AMM 73-11-07 (AALA202305115493). ACCOMPLISHED SATISFACTORY POWER ASSURANCE RUN PER JOB CARD 08L40072006 AND LEAK CHECK PER AMM 71-00-00.**(CLOSED)