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Flight crew turned off transponder to avoid detection of suspected altitude deviation. Later, controller advised their transponder was inoperative.
| Attributes | |
| ACN | 146617 |
| Time | |
| Date | 199005 |
| Day | Mon |
| Place | |
| Locale Reference | atc facility : hnl |
| State Reference | HI |
| Altitude | msl bound lower : 4000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : hnl |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 4650 |
| ASRS Report | 146617 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : far |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Inbound to honolulu we were cleared down to 4000' MSL. Center asked our altitude and my first officer thinking we were supposed to be at 6000' turned of our mode C and reported 6000'. I climbed up to 6000'. Center cleared us down 4000' and told us our mode C was inoperative. I had copied back 4000' and set it in my altitude select yet there was some communication confusion. I believe center should not accept just a 'roger' when giving a clearance and when given a proper readback listen to clearance readbacks to eliminate any confusion. I also think all carriers should have dual altitude selects or a joint used altitude select, I had to use a spare HSI to set altitudes in.
Original NASA ASRS Text
Title: FLT CREW TURNED OFF TRANSPONDER TO AVOID DETECTION OF SUSPECTED ALT DEVIATION. LATER, CTLR ADVISED THEIR TRANSPONDER WAS INOPERATIVE.
Narrative: INBND TO HONOLULU WE WERE CLRED DOWN TO 4000' MSL. CTR ASKED OUR ALT AND MY F/O THINKING WE WERE SUPPOSED TO BE AT 6000' TURNED OF OUR MODE C AND RPTED 6000'. I CLBED UP TO 6000'. CTR CLRED US DOWN 4000' AND TOLD US OUR MODE C WAS INOPERATIVE. I HAD COPIED BACK 4000' AND SET IT IN MY ALT SELECT YET THERE WAS SOME COM CONFUSION. I BELIEVE CTR SHOULD NOT ACCEPT JUST A 'ROGER' WHEN GIVING A CLRNC AND WHEN GIVEN A PROPER READBACK LISTEN TO CLRNC READBACKS TO ELIMINATE ANY CONFUSION. I ALSO THINK ALL CARRIERS SHOULD HAVE DUAL ALT SELECTS OR A JOINT USED ALT SELECT, I HAD TO USE A SPARE HSI TO SET ALTS IN.
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.