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An air carrier cargo flight descends below an MSA during radar vectoring by approach controller at mht and gets a GPWS alert 30 mi west of mht, nh.
| Attributes | |
| ACN | 538091 |
| Time | |
| Date | 200202 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : een.vortac |
| State Reference | NH |
| Altitude | msl single value : 3600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : mht.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer instruction : instructor oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 13500 flight time type : 2300 |
| ASRS Report | 538091 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain instruction : trainee |
| Events | |
| Anomaly | conflict : ground critical non adherence : far non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment : gpws other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued alert flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Chart Or Publication Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While under approach control's guidance, vectors and a descent to 3000 ft MSL was accepted. As I called out 4000 ft for 3000 ft, as PNF, both myself and the captain under IOE with me noticed terrain close to the aircraft. We initiated a climb back to 4000 ft, called ATC, and ended up blocking part of their transmission to us to climb to 4000 ft. As we had already initiated that action, I confirmed that we were already climbing, and that we had the terrain in sight. We had reached a low point of 3400 ft, and as we climbed through 3800 ft, the GPWS alerted us with a 'terrain, terrain' callout. This was totally a no-sweat event, as we were in visual contact with the ground at all times.
Original NASA ASRS Text
Title: AN ACR CARGO FLT DSNDS BELOW AN MSA DURING RADAR VECTORING BY APCH CTLR AT MHT AND GETS A GPWS ALERT 30 MI W OF MHT, NH.
Narrative: WHILE UNDER APCH CTL'S GUIDANCE, VECTORS AND A DSCNT TO 3000 FT MSL WAS ACCEPTED. AS I CALLED OUT 4000 FT FOR 3000 FT, AS PNF, BOTH MYSELF AND THE CAPT UNDER IOE WITH ME NOTICED TERRAIN CLOSE TO THE ACFT. WE INITIATED A CLB BACK TO 4000 FT, CALLED ATC, AND ENDED UP BLOCKING PART OF THEIR XMISSION TO US TO CLB TO 4000 FT. AS WE HAD ALREADY INITIATED THAT ACTION, I CONFIRMED THAT WE WERE ALREADY CLBING, AND THAT WE HAD THE TERRAIN IN SIGHT. WE HAD REACHED A LOW POINT OF 3400 FT, AND AS WE CLBED THROUGH 3800 FT, THE GPWS ALERTED US WITH A 'TERRAIN, TERRAIN' CALLOUT. THIS WAS TOTALLY A NO-SWEAT EVENT, AS WE WERE IN VISUAL CONTACT WITH THE GND AT ALL TIMES.
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.