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A lear 35A was taken for an engine run and a high speed taxi test. The lower cowling had been removed prior to the run and taxi test. During taxi test; lost the upper cowling.
| Attributes | |
| ACN | 706522 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : btl.tower |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 8500 flight time type : 2000 |
| ASRS Report | 706522 |
| Person 2 | |
| Affiliation | other |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other other : 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : testing performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Chart Or Publication Maintenance Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
I accompanied a mechanic aboard a lear 35A for an engine run to try to duplicate an engine problem. After a static run-up; we elected to do a high speed taxi down the runway to see if that would duplicate the problem. No flight was intended; planned; or performed. This was a ground only maintenance check. After the high speed taxi; we returned to the ramp where we discovered the upper cowling of the left engine was missing. The lower cowling had been removed prior to the run-up leaving the upper cowling only attached on the right side. The upper cowling had blown off during the high speed taxi. Upon discovery at the ramp; I immediately contacted ground advising them of the situation. Airport police did a runway check and found the departed cowling and returned it to us on the ramp. The cowling caused no damage to the aircraft upon departure. There was no damage to our aircraft; other aircraft; or property. The departed cowling sustained minor damage.
Original NASA ASRS Text
Title: A LEAR 35A WAS TAKEN FOR AN ENG RUN AND A HIGH SPD TAXI TEST. THE LOWER COWLING HAD BEEN REMOVED PRIOR TO THE RUN AND TAXI TEST. DURING TAXI TEST; LOST THE UPPER COWLING.
Narrative: I ACCOMPANIED A MECH ABOARD A LEAR 35A FOR AN ENG RUN TO TRY TO DUPLICATE AN ENG PROB. AFTER A STATIC RUN-UP; WE ELECTED TO DO A HIGH SPD TAXI DOWN THE RWY TO SEE IF THAT WOULD DUPLICATE THE PROB. NO FLT WAS INTENDED; PLANNED; OR PERFORMED. THIS WAS A GND ONLY MAINT CHK. AFTER THE HIGH SPD TAXI; WE RETURNED TO THE RAMP WHERE WE DISCOVERED THE UPPER COWLING OF THE L ENG WAS MISSING. THE LOWER COWLING HAD BEEN REMOVED PRIOR TO THE RUN-UP LEAVING THE UPPER COWLING ONLY ATTACHED ON THE R SIDE. THE UPPER COWLING HAD BLOWN OFF DURING THE HIGH SPD TAXI. UPON DISCOVERY AT THE RAMP; I IMMEDIATELY CONTACTED GND ADVISING THEM OF THE SITUATION. ARPT POLICE DID A RWY CHK AND FOUND THE DEPARTED COWLING AND RETURNED IT TO US ON THE RAMP. THE COWLING CAUSED NO DAMAGE TO THE ACFT UPON DEP. THERE WAS NO DAMAGE TO OUR ACFT; OTHER ACFT; OR PROPERTY. THE DEPARTED COWLING SUSTAINED MINOR DAMAGE.
Data retrieved from NASA's ASRS site as of January 2009 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.