<< >> NASA ASRS Report 697016, May 2006

A C560XL aborted takeoff at 70 KTS due to loss of steering control; caused by a disconnected steering lock pin.

Attributes
ACN	697016
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pwk.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : charter
Make Model Name	Citation Excel
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 5500 flight time type : 1600
ASRS Report	697016
Person 2
Affiliation	company : charter
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Chart Or Publication Aircraft
Primary Problem	Aircraft

Narrative:

Nosewheel steering pin disconnected on takeoff roll around 70 KTS. Aborted takeoff. Towed back to FBO after fire department ensured no smoke; fire; or other heat damage. 2 passenger on board were reassigned another aircraft. Steering pin installation on this aircraft is held in place with a small safety pin. The pin should not be removed during towing unless the tug has to exceed 90 degrees left/right of center; which should be very rare; if ever. Current production has replaced this safety pin the bolts to avoid events like the one described. The steering assembly looked ok on preflight; but I can't rule out pilot error in failing to catch a safety pin that was not quite latched properly after we were towed the previous evening (by line workers at FBO). Nothing was broken or sheared off on post incident maintenance inspection. Perhaps a lesson on extra careful preflight attention to murphy's law-prone components. As these planes go in for maintenance; the pin is being replaced by bolts (permanent).

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Original NASA ASRS Text

Title: A C560XL ABORTED TKOF AT 70 KTS DUE TO LOSS OF STEERING CTL; CAUSED BY A DISCONNECTED STEERING LOCK PIN.

Narrative: NOSEWHEEL STEERING PIN DISCONNECTED ON TKOF ROLL AROUND 70 KTS. ABORTED TKOF. TOWED BACK TO FBO AFTER FIRE DEPT ENSURED NO SMOKE; FIRE; OR OTHER HEAT DAMAGE. 2 PAX ON BOARD WERE REASSIGNED ANOTHER ACFT. STEERING PIN INSTALLATION ON THIS ACFT IS HELD IN PLACE WITH A SMALL SAFETY PIN. THE PIN SHOULD NOT BE REMOVED DURING TOWING UNLESS THE TUG HAS TO EXCEED 90 DEGS L/R OF CTR; WHICH SHOULD BE VERY RARE; IF EVER. CURRENT PRODUCTION HAS REPLACED THIS SAFETY PIN THE BOLTS TO AVOID EVENTS LIKE THE ONE DESCRIBED. THE STEERING ASSEMBLY LOOKED OK ON PREFLT; BUT I CAN'T RULE OUT PLT ERROR IN FAILING TO CATCH A SAFETY PIN THAT WAS NOT QUITE LATCHED PROPERLY AFTER WE WERE TOWED THE PREVIOUS EVENING (BY LINE WORKERS AT FBO). NOTHING WAS BROKEN OR SHEARED OFF ON POST INCIDENT MAINT INSPECTION. PERHAPS A LESSON ON EXTRA CAREFUL PREFLT ATTN TO MURPHY'S LAW-PRONE COMPONENTS. AS THESE PLANES GO IN FOR MAINT; THE PIN IS BEING REPLACED BY BOLTS (PERMANENT).

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.