# SDR P5CA9500778

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N850FT](https://openairdocs.org/aircraft/N850FT), registered now
- Make and model: Boeing 747122
- Aircraft serial: 19755
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Coupler
- Part number: 6223371002
- Condition: Failed
- Location: Nr 2
- Stage of operation: CR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA9500778

## Discrepancy

DUE TO RAPID INCREASE IN CABIN ALTITUDE WHEN NR 2 HF SYSTEM KEYED, PASSENGER MASKS DEPLOYED AND OXYGEN ACTIVATED.  REPLACED HF COUPLER, STOWED ALL MASKS AND RESET 02 FLOW CONTROL.

---
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.