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Air carrier large transport commits to overwater flight with less than mandated navigational equipment. See acn 175095 for related situation occurring the following day.
| Attributes | |
| ACN | 175077 |
| Time | |
| Date | 199104 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | ground : preflight other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| ASRS Report | 175077 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I took off from iah bnd for guatemala city, and when slightly south of galveston discovered that the #2 ADF was deactivated and unusable. Elected to proceed to destination west/O further incident. I felt with 2 working VOR's and only about 20 mins of dead reckoning between galveston and menida VOR, that I was ok, even if #1 ADF failed. The only corrective action I could suggest is that I should have picked up on #2 ADF not working on preflight and not relied on the copilot to be checking it. Supplemental information from acn 175072: once we were airborne, we discovered the second ADF was deactivated. We were committed to cross the gulf airspace using dead reckoning, VOR navigation and with single ADF. We tried unsuccessfully to contact dispatch while airborne. We contacted dispatch on the ground in gua.
Original NASA ASRS Text
Title: ACR LGT COMMITS TO OVERWATER FLT WITH LESS THAN MANDATED NAVIGATIONAL EQUIPMENT. SEE ACN 175095 FOR RELATED SITUATION OCCURRING THE FOLLOWING DAY.
Narrative: I TOOK OFF FROM IAH BND FOR GUATEMALA CITY, AND WHEN SLIGHTLY S OF GALVESTON DISCOVERED THAT THE #2 ADF WAS DEACTIVATED AND UNUSABLE. ELECTED TO PROCEED TO DEST W/O FURTHER INCIDENT. I FELT WITH 2 WORKING VOR'S AND ONLY ABOUT 20 MINS OF DEAD RECKONING BTWN GALVESTON AND MENIDA VOR, THAT I WAS OK, EVEN IF #1 ADF FAILED. THE ONLY CORRECTIVE ACTION I COULD SUGGEST IS THAT I SHOULD HAVE PICKED UP ON #2 ADF NOT WORKING ON PREFLT AND NOT RELIED ON THE COPLT TO BE CHKING IT. SUPPLEMENTAL INFO FROM ACN 175072: ONCE WE WERE AIRBORNE, WE DISCOVERED THE SECOND ADF WAS DEACTIVATED. WE WERE COMMITTED TO CROSS THE GULF AIRSPACE USING DEAD RECKONING, VOR NAV AND WITH SINGLE ADF. WE TRIED UNSUCCESSFULLY TO CONTACT DISPATCH WHILE AIRBORNE. WE CONTACTED DISPATCH ON THE GND IN GUA.
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.