<< >> NASA ASRS Report 575615, March 2003

An EMS pilot suffers damage to his rotary winged aircraft after losing control of it during a deicing procedure at ZZZ, us.

Attributes
ACN	575615
Time
Date	200303
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Weather Elements	Snow
Light	Daylight
Aircraft 1
Operator	Other
Make Model Name	Helicopter
Operating Under FAR Part	Part 135
Flight Phase	ground : parked
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 75 flight time total : 9350 flight time type : 350
ASRS Report	575615
Person 2
Function	other personnel other
Events
Anomaly	aircraft equipment problem : critical excursion : ramp non adherence : published procedure other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : overrode automation
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

During deicing process, aircraft was run-up to loosen ice on blades. With #1 engine running up to idle, vibration occurred. I went to shut down aircraft, and my hand left the full authority/authorized digital engine control switch, because of the vibration. I had difficulty turning off the full authority/authorized digital engine control switches. I attempted to shut down engine using the emergency shut-off, but discovered that the full authority/authorized digital engine control switches had been inadvertently turned off. After placing all switches into their proper position, a successful engine shutdown was accomplished. The aircraft turned on the pad, and visible damage was noticed on the tail rotor bumper. After further inspection, the rear landing gear tube was spread. It was never my intent to fly the helicopter at that time, just to aid in continuing deicing process of the helicopter.

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Original NASA ASRS Text

Title: AN EMS PLT SUFFERS DAMAGE TO HIS ROTARY WINGED ACFT AFTER LOSING CTL OF IT DURING A DEICING PROC AT ZZZ, US.

Narrative: DURING DEICING PROCESS, ACFT WAS RUN-UP TO LOOSEN ICE ON BLADES. WITH #1 ENG RUNNING UP TO IDLE, VIBRATION OCCURRED. I WENT TO SHUT DOWN ACFT, AND MY HAND LEFT THE FULL AUTH DIGITAL ENG CTL SWITCH, BECAUSE OF THE VIBRATION. I HAD DIFFICULTY TURNING OFF THE FULL AUTH DIGITAL ENG CTL SWITCHES. I ATTEMPTED TO SHUT DOWN ENG USING THE EMER SHUT-OFF, BUT DISCOVERED THAT THE FULL AUTH DIGITAL ENG CTL SWITCHES HAD BEEN INADVERTENTLY TURNED OFF. AFTER PLACING ALL SWITCHES INTO THEIR PROPER POS, A SUCCESSFUL ENG SHUTDOWN WAS ACCOMPLISHED. THE ACFT TURNED ON THE PAD, AND VISIBLE DAMAGE WAS NOTICED ON THE TAIL ROTOR BUMPER. AFTER FURTHER INSPECTION, THE REAR LNDG GEAR TUBE WAS SPREAD. IT WAS NEVER MY INTENT TO FLY THE HELI AT THAT TIME, JUST TO AID IN CONTINUING DEICING PROCESS OF THE HELI.

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.