Improper deicing procedures.

Attributes
ACN	300212
Time
Date	199501
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ybl
State Reference	BC
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 75 flight time total : 5600 flight time type : 600
ASRS Report	300212
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During taxi and passenger unloading approximately 1/4 to 1/2 inch of snow accumulated and adhered frozen to aircraft wings and surface. Conditions were light snow and temperature of 0 degree celsius. First officer advised captain we would need to have aircraft deiced. The FBO had the equipment and were available for call out. Next, the first officer went into FSS to commence departure planning. FSS and first officer noted captain was washing snow and ice off aircraft with hose water from a tanker truck. This was not approved deice fluid and again just froze to aircraft surface. First officer advised captain he was uncomfortable with this procedure. Captain advised first officer this is SOP and it was his takeoff. This is no different than takeoff in freezing rain. If you keep working the aircraft controls on climb out in these IMC conditions the ailerons will not freeze up. Cybl temperature remained at 0-1 degrees celsius and the wings were only lightly contaminated with ice on departure. Again, no incident occurred, but first officer advised captain he will not be part of this type deicing procedure again.

Original NASA ASRS Text

Title: IMPROPER DEICING PROCS.

Narrative: DURING TAXI AND PAX UNLOADING APPROX 1/4 TO 1/2 INCH OF SNOW ACCUMULATED AND ADHERED FROZEN TO ACFT WINGS AND SURFACE. CONDITIONS WERE LIGHT SNOW AND TEMP OF 0 DEG CELSIUS. FO ADVISED CAPT WE WOULD NEED TO HAVE ACFT DEICED. THE FBO HAD THE EQUIP AND WERE AVAILABLE FOR CALL OUT. NEXT, THE FO WENT INTO FSS TO COMMENCE DEP PLANNING. FSS AND FO NOTED CAPT WAS WASHING SNOW AND ICE OFF ACFT WITH HOSE WATER FROM A TANKER TRUCK. THIS WAS NOT APPROVED DEICE FLUID AND AGAIN JUST FROZE TO ACFT SURFACE. FO ADVISED CAPT HE WAS UNCOMFORTABLE WITH THIS PROC. CAPT ADVISED FO THIS IS SOP AND IT WAS HIS TKOF. THIS IS NO DIFFERENT THAN TKOF IN FREEZING RAIN. IF YOU KEEP WORKING THE ACFT CTLS ON CLBOUT IN THESE IMC CONDITIONS THE AILERONS WILL NOT FREEZE UP. CYBL TEMP REMAINED AT 0-1 DEGS CELSIUS AND THE WINGS WERE ONLY LIGHTLY CONTAMINATED WITH ICE ON DEP. AGAIN, NO INCIDENT OCCURRED, BUT FO ADVISED CAPT HE WILL NOT BE PART OF THIS TYPE DEICING PROC AGAIN.

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.