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The C130 autoplt altitude hold was unsuccessful in maintaining altitude on a celestial navigation training flight between little rock and knoxville. When the crew disengaged the autoplt the C130 pitched up 10 degrees to a rate of climb of 2000 FPM. The aircraft climbed 500 ft before the C130 could be brought back to its assigned altitude gracefully. The remainder of the flight was completed uneventfully by hand flying.
| Attributes | |
| ACN | 325800 |
| Time | |
| Date | 199601 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bna |
| State Reference | TN |
| Altitude | msl bound lower : 24000 msl bound upper : 24500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | other |
| Make Model Name | Hercules (C-130) |
| Operating Under FAR Part | other : other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : military |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 4000 flight time type : 3500 |
| ASRS Report | 325800 |
| Person 2 | |
| Affiliation | government : military |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : regained aircraft control flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cruise FL240 autoplt engaged altitude hold on. Aircraft began 100 FPM climb, autoplt fighting it. Autoplt was disengaged, aircraft pitched 10 degrees up and began 2000 FPM climb. Altitude gained was 500 ft FL245. Aircraft was recovered less aggressively than is allowable, due to crew member in transit to back of aircraft. Pilot was afraid of injuring crew member. No center warnings or deviations were called out. Autoplt was written up as discrepancy for maintenance. Aircraft was hand flown for remainder of flight. Aircraft was on a celestial navigation leg between little rock AFB and knoxville. Completion of flight was uneventful.
Original NASA ASRS Text
Title: THE C130 AUTOPLT ALT HOLD WAS UNSUCCESSFUL IN MAINTAINING ALT ON A CELESTIAL NAV TRAINING FLT BTWN LITTLE ROCK AND KNOXVILLE. WHEN THE CREW DISENGAGED THE AUTOPLT THE C130 PITCHED UP 10 DEGS TO A RATE OF CLB OF 2000 FPM. THE ACFT CLBED 500 FT BEFORE THE C130 COULD BE BROUGHT BACK TO ITS ASSIGNED ALT GRACEFULLY. THE REMAINDER OF THE FLT WAS COMPLETED UNEVENTFULLY BY HAND FLYING.
Narrative: CRUISE FL240 AUTOPLT ENGAGED ALT HOLD ON. ACFT BEGAN 100 FPM CLB, AUTOPLT FIGHTING IT. AUTOPLT WAS DISENGAGED, ACFT PITCHED 10 DEGS UP AND BEGAN 2000 FPM CLB. ALT GAINED WAS 500 FT FL245. ACFT WAS RECOVERED LESS AGGRESSIVELY THAN IS ALLOWABLE, DUE TO CREW MEMBER IN TRANSIT TO BACK OF ACFT. PLT WAS AFRAID OF INJURING CREW MEMBER. NO CTR WARNINGS OR DEVS WERE CALLED OUT. AUTOPLT WAS WRITTEN UP AS DISCREPANCY FOR MAINT. ACFT WAS HAND FLOWN FOR REMAINDER OF FLT. ACFT WAS ON A CELESTIAL NAV LEG BTWN LITTLE ROCK AFB AND KNOXVILLE. COMPLETION OF FLT WAS UNEVENTFUL.
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.