Service difficulty report · Actuator · Boeing 747230B

Difficulty date
January 11, 2001
Submitted
February 5, 2001
Operation
Air carrier
Aircraft
N744SA
Make and model
Boeing 747230B
Aircraft serial
22363
Part
Actuator
Part number
1U11986
Condition
Broken
Location
Nlg
Stage of operation
CR
How discovered
O
Nature of condition
K, J
Precautionary procedure
O

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

What was found

DURING CRUISE, THE RED GEAR WARNING LIGHT ILLUMINATED INTERMITTENTLY. PLACED GEAR HANDLE IN THE UP POSITION AND HEARD THUMPING NOISE APPARENTLY FROM THE NOSE LANDING GEAR (NLG) WHEEL WELL AREA WITH SUBSEQUENT LOSS OF NR 1 SYSTEM HYDRAULIC QUANTITY. PLACED GEAR HANDLE IN THE OFF POSITION AND NR 1 SYSTEM HYDRAULIC QUANTITY CONTINUED TO DECREASE DOWN TO ZERO. FOUND NLG FORWARD LEFT DOOR ACTUATOR UPPER HOUSING BROKEN (CASE SEPARATION) AND NLG FORWARD LEFT DOOR ASSEMBLY DAMAGED. REPLACED NLG FORWARD LEFT ACTUATOR AND DOOR ASSEMBLIES. (M)