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Pilot of an small transport reciprocating twin made an emergency on airport landing after being unable to restart a feathered engine during a maintenance test flight. Purpose of the flight was to check the propeller feathering system and the right engine was feathered. However, the left generating system failed, and the battery had insufficient power to restart the feathered engine or to put the wing flaps and gear down.
| Attributes | |
| ACN | 395576 |
| Time | |
| Date | 199803 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lwc |
| State Reference | KS |
| Altitude | agl bound lower : 500 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : instructional |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other landing : go around landing other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | other other : other pilot : atp |
| Experience | flight time last 90 days : 8 flight time total : 2500 flight time type : 100 |
| ASRS Report | 395576 |
| Person 2 | |
| Affiliation | Other |
| Function | other personnel other |
| Qualification | other other : other |
| 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 other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
During a maintenance check flight, the right engine was shut down to verify operation of propeller feathering/unfeathering. At this time left alternator failed and was unable to restart right engine. Gear/flaps were left up until landing was assured and then selected down. Flaps did not operate, gear did not show down and locked. A go around was executed with minimal climb capability resulting. A low level circuit, less than 500 ft due to inability to climb, was conducted. Emergency gear extension procedure was reviewed/carried out. A successful 1 engine, flaps up landing resulted. In retrospect, the inability of gear to extend should have been anticipated. Emergency gear extension procedure should have been reviewed and prepared for the first approach attempt. This would have avoided need for single engine go around.
Original NASA ASRS Text
Title: PLT OF AN SMT RECIPROCATING TWIN MADE AN EMER ON ARPT LNDG AFTER BEING UNABLE TO RESTART A FEATHERED ENG DURING A MAINT TEST FLT. PURPOSE OF THE FLT WAS TO CHK THE PROP FEATHERING SYS AND THE R ENG WAS FEATHERED. HOWEVER, THE L GENERATING SYS FAILED, AND THE BATTERY HAD INSUFFICIENT PWR TO RESTART THE FEATHERED ENG OR TO PUT THE WING FLAPS AND GEAR DOWN.
Narrative: DURING A MAINT CHK FLT, THE R ENG WAS SHUT DOWN TO VERIFY OP OF PROP FEATHERING/UNFEATHERING. AT THIS TIME L ALTERNATOR FAILED AND WAS UNABLE TO RESTART R ENG. GEAR/FLAPS WERE LEFT UP UNTIL LNDG WAS ASSURED AND THEN SELECTED DOWN. FLAPS DID NOT OPERATE, GEAR DID NOT SHOW DOWN AND LOCKED. A GAR WAS EXECUTED WITH MINIMAL CLB CAPABILITY RESULTING. A LOW LEVEL CIRCUIT, LESS THAN 500 FT DUE TO INABILITY TO CLB, WAS CONDUCTED. EMER GEAR EXTENSION PROC WAS REVIEWED/CARRIED OUT. A SUCCESSFUL 1 ENG, FLAPS UP LNDG RESULTED. IN RETROSPECT, THE INABILITY OF GEAR TO EXTEND SHOULD HAVE BEEN ANTICIPATED. EMER GEAR EXTENSION PROC SHOULD HAVE BEEN REVIEWED AND PREPARED FOR THE FIRST APCH ATTEMPT. THIS WOULD HAVE AVOIDED NEED FOR SINGLE ENG GAR.
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.