 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier first officer reported receiving a RA in rvsm airspace. The pilot stated the aircraft's altimeters were off by 180 feet.
| Attributes | |
| ACN | 1604515 |
| Time | |
| Date | 201812 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Widebody Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Altimeter |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Conflict Airborne Conflict |
Narrative:
I was pilot flying; captain was pilot monitoring; and first officer was resting. Notable weather was intermittent light turbulence; and undercast. Near [coordinates] on nat F; we were being passed by [another air carrier]; 1000 ft below. We were on a 2M slop and they appeared to be on a 1M slop. After a few tas; with them in sight; we received an RA; essentially telling us to stay level. We observed them by visual reference and TCAS to be turning left (away; towards the track) and descending. Contact with [other air carrier] on [frequency] confirmed that they would stay on track while passing us. We communicated the incident with ATC via HF; and confirmed our position; route; slop; and altitude. A notable factor was some irregularities we observed with the left altimeter; namely that it was more erratic than normal / the right altimeter; meaning that it deviated more (about our cruise altitude) in anything but smooth air (+/- 40' in light; and +/- 80' in moderate). Additionally; the two altimeters were near the 200 ft rvsm limit (180-200 ft). In fact; we did later get an altitude disagree EICAS message. For that; we completed the QRH; consulted the flight operations manual; and made a logbook entry.
Original NASA ASRS Text
Title: Air carrier First Officer reported receiving a RA in RVSM airspace. The pilot stated the aircraft's altimeters were off by 180 feet.
Narrative: I was Pilot Flying; Captain was Pilot Monitoring; and First Officer was resting. Notable weather was intermittent light turbulence; and undercast. Near [coordinates] on NAT F; we were being passed by [another air carrier]; 1000 FT below. We were on a 2M SLOP and they appeared to be on a 1M SLOP. After a few TAs; with them in sight; we received an RA; essentially telling us to stay level. We observed them by visual reference and TCAS to be turning left (away; towards the track) and descending. Contact with [other air carrier] on [frequency] confirmed that they would stay on track while passing us. We communicated the incident with ATC via HF; and confirmed our position; route; SLOP; and altitude. A notable factor was some irregularities we observed with the L Altimeter; namely that it was more erratic than normal / the R Altimeter; meaning that it deviated more (about our cruise altitude) in anything but smooth air (+/- 40' in light; and +/- 80' in moderate). Additionally; the two altimeters were near the 200 FT RVSM limit (180-200 FT). In fact; we did later get an ALT DISAGREE EICAS message. For that; we completed the QRH; consulted the Flight Operations Manual; and made a logbook entry.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.