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Captain of an LR24 descended below assigned departure altitude due to overcorrecting from overspd warning, which became stuck.
| Attributes | |
| ACN | 401128 |
| Time | |
| Date | 199804 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : svm airport : yip |
| State Reference | MI |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 24 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors enroute airway : dtw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 20 flight time total : 5600 flight time type : 2000 |
| ASRS Report | 401128 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After departure from yip in climb to cleared altitude, overspd warning failed and stuck. First officer was wearing headset and I did not hear proper altitude clearance due to captain's audio system being disabled for overspd warning. Descended below cleared altitude, due to confusion. Emergency sits should dictate both pilots hearing same ATC instructions. No headsets.
Original NASA ASRS Text
Title: CAPT OF AN LR24 DSNDED BELOW ASSIGNED DEP ALT DUE TO OVERCORRECTING FROM OVERSPD WARNING, WHICH BECAME STUCK.
Narrative: AFTER DEP FROM YIP IN CLB TO CLRED ALT, OVERSPD WARNING FAILED AND STUCK. FO WAS WEARING HEADSET AND I DID NOT HEAR PROPER ALT CLRNC DUE TO CAPT'S AUDIO SYS BEING DISABLED FOR OVERSPD WARNING. DSNDED BELOW CLRED ALT, DUE TO CONFUSION. EMER SITS SHOULD DICTATE BOTH PLTS HEARING SAME ATC INSTRUCTIONS. NO HEADSETS.
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.