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First officer of widebody transport air carrier aircraft deviated from assigned altitude in response to a GPWS warning.
| Attributes | |
| ACN | 238788 |
| Time | |
| Date | 199304 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ewr |
| State Reference | NJ |
| Altitude | msl bound lower : 7000 msl bound upper : 7350 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 114 flight time total : 14000 flight time type : 3600 |
| ASRS Report | 238788 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 16000 flight time type : 200 |
| ASRS Report | 238634 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On vectors by ny approach control. Assigned 7000 ft and heading 180 degrees departing sparta VOR for vectors to runway 04L ewr. WX IFR -- thunderstorms and moderate turbulence. Went into an area of extremely heavy precipitation. Possibly hail. First officer flying and on autoplt. GPWS gave a continuous warning of 'terrain -- terrain.' first officer instinctively took aircraft off autoplt and applied maximum thrust while rotating aircraft up. Aircraft climbed approximately 300 ft as I was contacting approach to query possibility of terrain in area. Ny said 'no terrain' and asked us to return to 7000 ft due another aircraft in area at 8000 ft -- complied. GPWS still giving warning. Flight engineer pulled circuit breaker to silence. Suspected warning was triggered by heavy precipitation.
Original NASA ASRS Text
Title: FO OF WDB ACR ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A GPWS WARNING.
Narrative: ON VECTORS BY NY APCH CTL. ASSIGNED 7000 FT AND HDG 180 DEGS DEPARTING SPARTA VOR FOR VECTORS TO RWY 04L EWR. WX IFR -- TSTMS AND MODERATE TURB. WENT INTO AN AREA OF EXTREMELY HVY PRECIPITATION. POSSIBLY HAIL. FO FLYING AND ON AUTOPLT. GPWS GAVE A CONTINUOUS WARNING OF 'TERRAIN -- TERRAIN.' FO INSTINCTIVELY TOOK ACFT OFF AUTOPLT AND APPLIED MAX THRUST WHILE ROTATING ACFT UP. ACFT CLBED APPROX 300 FT AS I WAS CONTACTING APCH TO QUERY POSSIBILITY OF TERRAIN IN AREA. NY SAID 'NO TERRAIN' AND ASKED US TO RETURN TO 7000 FT DUE ANOTHER ACFT IN AREA AT 8000 FT -- COMPLIED. GPWS STILL GIVING WARNING. FE PULLED CIRCUIT BREAKER TO SILENCE. SUSPECTED WARNING WAS TRIGGERED BY HVY PRECIPITATION.
Data retrieved from NASA's ASRS site as of July 2007 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.