SDR 9513046603

Service difficulty report · Ins · Boeing 747151

Difficulty date: August 23, 1995
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N603US
Make and model: Boeing 747151
Aircraft serial: 19780
System (JASC): 3441 · Inertial Guidance System
Part: Ins
Part number: 7883450041
Condition: Malfunctioned
Location: Nr 3
Stage of operation: TO
Nature of condition: J
Precautionary procedure: J, A

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

What was found

AFTER TAKEOFF WITH NR 3 INS ON MEL, THE NR 1 INS WENT OUT OF TOLERANCE. CREW FOLLOWED COCKPIT OPERATING PROCEDURE, DUMPED 50,000 LBS OF FUEL, RETURNED TO HNL AND LANDED WITHOUT FURTHER INCIDENTS. MAINTENANCE REPLACED NR 1 INS AND PERFORMED FUNCTIONAL CHECK, UNIT TESTED NORMAL.