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Air carrier medium large transport received a GPWS warning while on vectors to roa at night IMC. Captain climbed to clear the warning and got clearance to higher altitude.
| Attributes | |
| ACN | 187319 |
| Time | |
| Date | 199108 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : roa |
| State Reference | VA |
| Altitude | msl bound lower : 5000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : roa |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 187319 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight clt-roa, aug/sat/91. 15 mi from roa VOR in sight, instrument conditions over mountainous terrain, we were level at 5000 ft MSL and received a GPWS warning 'terrain terrain pull up'. The validity of the warning could not be determined so per flight manual procedures the captain executed an immediate climb. I asked for a higher altitude from roa approach immediately, the controller gave us a lengthy dissertation on why it must be a false warning. Finally after a more emphatic request we received clearance to 2000 ft higher or 7000 ft MSL. A normal ILS 33 approach to roa was performed without incident.
Original NASA ASRS Text
Title: ACR MLG RECEIVED A GPWS WARNING WHILE ON VECTORS TO ROA AT NIGHT IMC. CAPT CLBED TO CLR THE WARNING AND GOT CLRNC TO HIGHER ALT.
Narrative: FLT CLT-ROA, AUG/SAT/91. 15 MI FROM ROA VOR IN SIGHT, INST CONDITIONS OVER MOUNTAINOUS TERRAIN, WE WERE LEVEL AT 5000 FT MSL AND RECEIVED A GPWS WARNING 'TERRAIN TERRAIN PULL UP'. THE VALIDITY OF THE WARNING COULD NOT BE DETERMINED SO PER FLT MANUAL PROCS THE CAPT EXECUTED AN IMMEDIATE CLB. I ASKED FOR A HIGHER ALT FROM ROA APCH IMMEDIATELY, THE CTLR GAVE US A LENGTHY DISSERTATION ON WHY IT MUST BE A FALSE WARNING. FINALLY AFTER A MORE EMPHATIC REQUEST WE RECEIVED CLRNC TO 2000 FT HIGHER OR 7000 FT MSL. A NORMAL ILS 33 APCH TO ROA WAS PERFORMED WITHOUT INCIDENT.
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.