What was found
AIR TURN BACK DUE TO NR 1 INS RED WARNING LIGHT ON WITH HDG AND FLIGHT DIRECTOR FLAGS IN VIEW. FOUND NR 1 INU FAILED. REPLACED INU, OPS CHECKED OK.
- Difficulty date
- December 24, 2008
- Submitted
- January 2, 2009
- Operation
- Air carrier
- Aircraft
- N809MC
- Make and model
- Boeing 747228F
- Aircraft serial
- 20887
- Aircraft time
- 109,235 hours, 2,744 cycles
- System (JASC)
- 3441 · Inertial Guidance System
- Part
- Inu
- Part number
- 46300161300413
- Part serial
- 1519
- Condition
- Failed
- Location
- Nr 1
- Stage of operation
- CL
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.