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An small transport flight crew overshot their assigned altitude while troubleshooting a microphone problem. The altitude alert sounded and the flight crew was able to respond within 300 ft of their assigned altitude. Altitude overshot altitude deviation.
| Attributes | |
| ACN | 328450 |
| Time | |
| Date | 199602 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : leb |
| State Reference | NH |
| Altitude | msl bound lower : 26000 msl bound upper : 26300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 13000 flight time type : 1200 |
| ASRS Report | 328450 |
| Person 2 | |
| Affiliation | government other |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 800 |
| ASRS Report | 328317 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing out to our assigned (filed) altitude of FL240 -- ZBW told us to climb to FL260 for traffic. I was the PIC PNF in the right seat. About this time I was preoccupied with a microphone problem in my headset. Because of this I distracted the PF. The altitude set was changed for FL260, but unnoticed by both of us, the altitude select mode on the glare-shield was not armed. The PF missed it and I missed it. As we continued to figure out my microphone problem, both of us heard the altitude alert tone sound. The PF arrested the climb and descended to FL260. The unexpected climb to FL260, flying directly into the sun (making the autoplt mode selector almost invisible), and the autoplt system itself, were contributing factors. If an altitude change is made while in the altitude capture mode, the mode is canceled and will not capture the new selected altitude unless the climb mode or altitude select mode is pushed. We were involved with a minor problem and our situational awareness and priorities were lacking. A better procedure for altitude awareness is in the works so this won't happen again.
Original NASA ASRS Text
Title: AN SMT FLC OVERSHOT THEIR ASSIGNED ALT WHILE TROUBLESHOOTING A MIKE PROB. THE ALT ALERT SOUNDED AND THE FLC WAS ABLE TO RESPOND WITHIN 300 FT OF THEIR ASSIGNED ALT. ALT OVERSHOT ALTDEV.
Narrative: CLBING OUT TO OUR ASSIGNED (FILED) ALT OF FL240 -- ZBW TOLD US TO CLB TO FL260 FOR TFC. I WAS THE PIC PNF IN THE R SEAT. ABOUT THIS TIME I WAS PREOCCUPIED WITH A MIKE PROB IN MY HEADSET. BECAUSE OF THIS I DISTRACTED THE PF. THE ALT SET WAS CHANGED FOR FL260, BUT UNNOTICED BY BOTH OF US, THE ALT SELECT MODE ON THE GLARE-SHIELD WAS NOT ARMED. THE PF MISSED IT AND I MISSED IT. AS WE CONTINUED TO FIGURE OUT MY MIKE PROB, BOTH OF US HEARD THE ALT ALERT TONE SOUND. THE PF ARRESTED THE CLB AND DSNDED TO FL260. THE UNEXPECTED CLB TO FL260, FLYING DIRECTLY INTO THE SUN (MAKING THE AUTOPLT MODE SELECTOR ALMOST INVISIBLE), AND THE AUTOPLT SYS ITSELF, WERE CONTRIBUTING FACTORS. IF AN ALT CHANGE IS MADE WHILE IN THE ALT CAPTURE MODE, THE MODE IS CANCELED AND WILL NOT CAPTURE THE NEW SELECTED ALT UNLESS THE CLB MODE OR ALT SELECT MODE IS PUSHED. WE WERE INVOLVED WITH A MINOR PROB AND OUR SITUATIONAL AWARENESS AND PRIORITIES WERE LACKING. A BETTER PROC FOR ALT AWARENESS IS IN THE WORKS SO THIS WON'T HAPPEN AGAIN.
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.