<< >> NASA ASRS Report 166120, December 1990

GA small aircraft gear collapsed on landing at hpn. In-flight electrical failure preceeded the landing.

Attributes
ACN	166120
Time
Date	199012
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : phl
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 6 flight time total : 600 flight time type : 6
ASRS Report	166120
Person 2
Affiliation	Other
Function	observation : observer
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 25 flight time total : 810 flight time type : 600
ASRS Report	166121
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency none taken : detected after the fact none taken : anomaly accepted
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

Practicing ILS approachs to hpn runway 16 on ILS. On third approach noticed altitude light on panel and decided to make full stop landing on current approach to determine nature of problem. Turned off all unnecessary electrical load dropped gear and felt effect of gear drag. Within 1-2 min from noticing altitude light radio communication became garbled ; notified ATC of altitude problem; cleared for approach. HSI warning flag of loss of G/south. Advised ATC of emergency, but no response due to radio loss. Turned on standby generator; made me transmission of emergency and squawked 7700; ATC acknowledged and cleared to land; electrical power lost. Continued on approximately localizer descent; broke climbing at approximately 500' about 1 mi east of runway 16. Attempted to locate crank to confirm gear down and locked; once over the numbers decided to land based on assumption that gear was down and not wanting to risk low altitude turn; a gear collapsed on landing. No injuries, believe selected safest alternative under the circumstances. Supplemental information from 166121. On localizer 11 mi out 'alternator out' light lit and battery discharge indicated. Started shutting down elecrical equipment, declared emergency, squawked '7700'. Turned on emergency generator and actuated landing gear. Temporary '3 green' indicator lit.

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Original NASA ASRS Text

Title: GA SMA GEAR COLLAPSED ON LNDG AT HPN. INFLT ELECTRICAL FAILURE PRECEEDED THE LNDG.

Narrative: PRACTICING ILS APCHS TO HPN RWY 16 ON ILS. ON THIRD APCH NOTICED ALT LIGHT ON PANEL AND DECIDED TO MAKE FULL STOP LNDG ON CURRENT APCH TO DETERMINE NATURE OF PROB. TURNED OFF ALL UNNECESSARY ELECTRICAL LOAD DROPPED GEAR AND FELT EFFECT OF GEAR DRAG. WITHIN 1-2 MIN FROM NOTICING ALT LIGHT RADIO COM BECAME GARBLED ; NOTIFIED ATC OF ALT PROB; CLRED FOR APCH. HSI WARNING FLAG OF LOSS OF G/S. ADVISED ATC OF EMER, BUT NO RESPONSE DUE TO RADIO LOSS. TURNED ON STANDBY GENERATOR; MADE ME XMISSION OF EMER AND SQUAWKED 7700; ATC ACKNOWLEDGED AND CLRED TO LAND; ELECTRICAL PWR LOST. CONTINUED ON APPROX LOC DSNT; BROKE CLBING AT APPROX 500' ABOUT 1 MI E OF RWY 16. ATTEMPTED TO LOCATE CRANK TO CONFIRM GEAR DOWN AND LOCKED; ONCE OVER THE NUMBERS DECIDED TO LAND BASED ON ASSUMPTION THAT GEAR WAS DOWN AND NOT WANTING TO RISK LOW ALT TURN; A GEAR COLLAPSED ON LNDG. NO INJURIES, BELIEVE SELECTED SAFEST ALTERNATIVE UNDER THE CIRCUMSTANCES. SUPPLEMENTAL INFO FROM 166121. ON LOC 11 MI OUT 'ALTERNATOR OUT' LIGHT LIT AND BATTERY DISCHARGE INDICATED. STARTED SHUTTING DOWN ELECRICAL EQUIP, DECLARED EMER, SQUAWKED '7700'. TURNED ON EMER GENERATOR AND ACTUATED LNDG GEAR. TEMPORARY '3 GREEN' INDICATOR LIT.

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.