Service difficulty report · Hmu · Saab SF340A

Difficulty date
December 2, 2021
Submitted
December 9, 2021
Operation
Air carrier
Aircraft
N631BC
Make and model
Saab SF340A
Aircraft serial
340A061
Aircraft time
45,284 hours, 43,797 cycles
Engine
Ge CT75A2
Engine time
39,934 hours, 41,413 cycles
Part
Hmu
Part number
78550034
Part serial
UDAJ3379
Condition
Faulted
Stage of operation
AP
How discovered
O
Nature of condition
O
Precautionary procedure
L, E

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

What was found

SUPPLEMENTAL - ON GO AROUND RWY 26R AT MIA ENG 1 OIL PRESS LT CAME ON, LOST POWER, MEMORY ITEMS, DECLARED EMERGENCY AND QRH COMPLY. - DURING T/S FOUND AT BOTTOMING GOVERNOR CONNECTED NP OVER SHOOTS 140 RPM NEED TO 1500 RPM AND RETURNED TO NORMAL READINGS. PROCEEDED TO FOLLOW ON CT7-5, FIM AND SAAB 340, FIM, REQUIRES FURTHER T/S. R/R ECU SWAPPED OVD LH TO RH PERFORMED ENGINE RUN CHECK AUTOCOARSEN R/R #1 ENGINE HMU IAW CT7-5 73-00-00. PENDING OPS CHECK. NO DEFECTS NOTED. P/N OFF:785500-34 S/N OFF:UDAJ3379. PERFORMED #1 ENGINE RUNS IAW CT7-5, 72-00-00 OPS CHECK AND LEAK CHECK SATISFACTORY.

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