Service difficulty report · Hmu · Boeing 7377H4

Difficulty date
December 29, 2019
Submitted
January 3, 2020
Operation
Air carrier
Aircraft
N719SW
Make and model
Boeing 7377H4
Aircraft serial
27853
Aircraft time
74,516 hours, 44,532 cycles
Part
Hmu
Part number
4426563
Part serial
BELW3842
Condition
Faulty
Location
Nr 1 Engine
Stage of operation
CL
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

SUPPLEMENTAL INFORMATION, UPON SETTING TAKEOFF THRUST, NR 2 THRUST LEVER AT 89% N1, NR 1 THRUST LEVER GOT TO 84% N1 WITH THRUST LEVER MATCHED. PUSHED NR 1 THRUST LEVER UP TO APPROXIMATELY 86% N1, N1 DROPPED TO 83-84%, ABOVE 1000, NR 2 THRUST LEVER AT 94% N1, NR 1 THRUST LEVER PUSHED UP TO AS FAR AS 90% N1, NR 1 THRUST LEVER FIVE TO SIX THRUST LEVER KNOBS WIDTH SPLIT WITH NR 2. ABOVE 1000, THRUST LEVER SPLIT DECREASED TO 3 KNOBS WIDTH. CLIMB OUT ABOVE FL230, THRUST LEVER MATCHED, N1'S MATCHED. ALL NORMAL IN CRUISE. DESCENT APP AND LANDING. NO AUTO THROTTLES THROUGHOUT. NO EGT EXCEEDANCES. R&R NR 1 ENGINE HYDRO MECHANICAL UNIT PER MT.

More about the Boeing 737-7H4