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C402 pilot, reading only his altitude, allows aircraft to set up a descent in a cftt. The #2 altitude encoder alerts ATC as to the actual altitude. ATC gives pilot a wake up call on the altitude deviation altitude excursion.
| Attributes | |
| ACN | 341270 |
| Time | |
| Date | 199607 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zan |
| State Reference | AK |
| Altitude | msl bound lower : 8600 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Cessna 402/402C/B379 Businessliner/Utiliner |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : v319 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 5500 flight time type : 450 |
| ASRS Report | 341270 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : provided flight assist flight crew : returned to intended course or assigned course flight crew : became reoriented other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While en route from ksm to anc on V319 ATC advised I was squawking 8500 ft in a descent. Pilot's altimeter read 12000 ft. I was instructed to stop altitude squawk and reset transponder. As I was resetting the encoder I checked #2 altimeter which read approximately 8600 ft. An immediate climb was initiated back to 12000 ft and the flight was concluded. Both altimeters should be included in the scan.
Original NASA ASRS Text
Title: C402 PLT, READING ONLY HIS ALT, ALLOWS ACFT TO SET UP A DSCNT IN A CFTT. THE #2 ALT ENCODER ALERTS ATC AS TO THE ACTUAL ALT. ATC GIVES PLT A WAKE UP CALL ON THE ALTDEV ALT EXCURSION.
Narrative: WHILE ENRTE FROM KSM TO ANC ON V319 ATC ADVISED I WAS SQUAWKING 8500 FT IN A DSCNT. PLT'S ALTIMETER READ 12000 FT. I WAS INSTRUCTED TO STOP ALT SQUAWK AND RESET XPONDER. AS I WAS RESETTING THE ENCODER I CHKED #2 ALTIMETER WHICH READ APPROX 8600 FT. AN IMMEDIATE CLB WAS INITIATED BACK TO 12000 FT AND THE FLT WAS CONCLUDED. BOTH ALTIMETERS SHOULD BE INCLUDED IN THE SCAN.
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.