Aircraft damage caused by failure of aircraft lifting equipment.

Attributes
ACN	303250
Time
Date	199504
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ind
State Reference	IN
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	303250
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other pilot : private
Experience	flight time last 90 days : 6 flight time total : 250
ASRS Report	303414
Events
Anomaly	other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Air Traffic Incident	other

Narrative:

Air carrier aircraft, a fokker F-100, was being jacked for the purpose of performing air carrier job card #MM idented as PCI800 (F-100 aircraft weighing procedures with cell scales). This pci was being accomplished by 3 mechanics, 1 at each jack, a lead mechanic monitoring the aircraft leveling instrument and 2 inspectors accomplishing the actual weighing of the aircraft. My job was to operate the nose jack, this pci requires manual jacking. The nosewheels were off of the floor and the aircraft was level. The main wheels were about to come off of the floor when the left wing jack cell scale pin sheared off and the jack jumped outboard stopping at the flap fairing then puncturing the wing. The aircraft lifted off of the nose jack and then the right wing jack cell scale pin sheared off and the jack jumped outboard and aft of the wing aft spar then puncturing the flap well panel, then the aircraft nose came down causing the fuselage jack pad to strike the jack weighing cell on top of the nose jack and kicking the jack away from the aircraft. No one was seriously injured. The aircraft sustained considerable wing damage. I believe that the weigh cell jack adapter hole is reduced so small that it provides a weak link between the jack and the weigh cell and that the pin that goes into this adapter may have become weakened or cracked from previous use.

Original NASA ASRS Text

Title: ACFT DAMAGE CAUSED BY FAILURE OF ACFT LIFTING EQUIP.

Narrative: ACR ACFT, A FOKKER F-100, WAS BEING JACKED FOR THE PURPOSE OF PERFORMING ACR JOB CARD #MM IDENTED AS PCI800 (F-100 ACFT WEIGHING PROCS WITH CELL SCALES). THIS PCI WAS BEING ACCOMPLISHED BY 3 MECHS, 1 AT EACH JACK, A LEAD MECH MONITORING THE ACFT LEVELING INST AND 2 INSPECTORS ACCOMPLISHING THE ACTUAL WEIGHING OF THE ACFT. MY JOB WAS TO OPERATE THE NOSE JACK, THIS PCI REQUIRES MANUAL JACKING. THE NOSEWHEELS WERE OFF OF THE FLOOR AND THE ACFT WAS LEVEL. THE MAIN WHEELS WERE ABOUT TO COME OFF OF THE FLOOR WHEN THE L WING JACK CELL SCALE PIN SHEARED OFF AND THE JACK JUMPED OUTBOARD STOPPING AT THE FLAP FAIRING THEN PUNCTURING THE WING. THE ACFT LIFTED OFF OF THE NOSE JACK AND THEN THE R WING JACK CELL SCALE PIN SHEARED OFF AND THE JACK JUMPED OUTBOARD AND AFT OF THE WING AFT SPAR THEN PUNCTURING THE FLAP WELL PANEL, THEN THE ACFT NOSE CAME DOWN CAUSING THE FUSELAGE JACK PAD TO STRIKE THE JACK WEIGHING CELL ON TOP OF THE NOSE JACK AND KICKING THE JACK AWAY FROM THE ACFT. NO ONE WAS SERIOUSLY INJURED. THE ACFT SUSTAINED CONSIDERABLE WING DAMAGE. I BELIEVE THAT THE WEIGH CELL JACK ADAPTER HOLE IS REDUCED SO SMALL THAT IT PROVIDES A WEAK LINK BTWN THE JACK AND THE WEIGH CELL AND THAT THE PIN THAT GOES INTO THIS ADAPTER MAY HAVE BECOME WEAKENED OR CRACKED FROM PREVIOUS USE.

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.