# SDR MEX2003061

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2003
- Submitted: April 17, 2003
- Operation: Air carrier
- Aircraft: N1075T
- Make and model: Doug DC-9-87
- Registry model: [Doug DC-9-87](https://openairdocs.org/model/mcdonnell-douglas-dc-9-87) (OpenAirDocs)
- Aircraft serial: 49724
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Display
- Part number: 4688000307
- Condition: Failed
- Location: Ahru
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MEX2003061

## Discrepancy

FLT 169 - CUL-MEX - AIRTURN BACK, DURING CLIMB IN THE FMA, AP TRIM THE NO AUTO LAND MESSAGE WAS SHOWN.  THERE WAS A DIFFERENCE BETWEEN RMI'S OF 170 DEGREES.  THE FD DISAPPEAR WITHOUT OBEY AUTO THROT AT SELECTED VELOCITIES.  TESTS WERE PERFORMED IN STP AND SYSTEM WAS OK.  DURING OVERNIGHT SERVICE THE AHRU NR 2 WAS REPLACED IAW MM 34-21-10, TEST PERFORMED IAW MM 22-01-05, ALL CORRECT.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.