 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An A319's a/P; a/T; F/D all disconnected allowing the aircraft to descend 150 ft at FL340. All functions were recovered. Crew suspected a lightning strike.
| Attributes | |
| ACN | 733895 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : act.airport |
| State Reference | TX |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 20000 flight time type : 800 |
| ASRS Report | 733895 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather |
| Independent Detector | aircraft equipment other aircraft equipment : a/p a/t f/d other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : regained aircraft control flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Environmental Factor Aircraft |
| Primary Problem | Ambiguous |
Narrative:
We lost both autoplts; flight directors; and autothrust. The aural altitude alert was sounding and we silenced it. The captain was the PF. The first officer's and standby altimeters indicated about 150 ft low. In correcting back to FL340; ATC asked us to check our altitude. We determined that the captain's altimeter was the most accurate. Re-established the autoplt; first officer's; and autothrust; checked that the altimeters were within limits and continued the flight without incident. We suspect a probable lightning strike. We had dispatched with an inoperative #2 adr; which may have contributed.
Original NASA ASRS Text
Title: AN A319'S A/P; A/T; F/D ALL DISCONNECTED ALLOWING THE ACFT TO DESCEND 150 FT AT FL340. ALL FUNCTIONS WERE RECOVERED. CREW SUSPECTED A LIGHTNING STRIKE.
Narrative: WE LOST BOTH AUTOPLTS; FLT DIRECTORS; AND AUTOTHRUST. THE AURAL ALT ALERT WAS SOUNDING AND WE SILENCED IT. THE CAPT WAS THE PF. THE FO'S AND STANDBY ALTIMETERS INDICATED ABOUT 150 FT LOW. IN CORRECTING BACK TO FL340; ATC ASKED US TO CHK OUR ALT. WE DETERMINED THAT THE CAPT'S ALTIMETER WAS THE MOST ACCURATE. RE-ESTABLISHED THE AUTOPLT; FO'S; AND AUTOTHRUST; CHKED THAT THE ALTIMETERS WERE WITHIN LIMITS AND CONTINUED THE FLT WITHOUT INCIDENT. WE SUSPECT A PROBABLE LIGHTNING STRIKE. WE HAD DISPATCHED WITH AN INOP #2 ADR; WHICH MAY HAVE CONTRIBUTED.
Data retrieved from NASA's ASRS site as of January 2009 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.