SA226 encounters ice and is unable to maintain requested speed and altitude southeast of burley, ide...

Attributes
ACN	464100
Time
Date	200002
Day	Wed
Local Time Of Day	1801 To 2400
Place
State Reference	ID
Altitude	msl bound lower : 16600 msl bound upper : 17000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	SA-226 TC Metro II
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Route In Use	arrival star : bearr 4
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 2800 flight time type : 600
ASRS Report	464100
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other non adherence : clearance other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

Copilot flying. Aircraft at 17000 ft, 180 KTS, full power, and light rime ice on wings. Center requests 150 KTS. Copilot reduces power and at 150 KTS copilot increases power. Airspeed slows to 140 KTS and begins to descend. Full power applied, no increase in airspeed aircraft continues descent. At 200 ft below altitude captain requests block altitude but does not specify altitude. 300 ft below altitude captain informs center unable 150 KTS and 17000 ft. At 16600 ft airplane accelerates to 160 KTS and climbs back to 17000 ft. Problem: 1) captain did not know aircraft performance capabilities in this environment. 2) captain unable to communicate clearly with center ahead of time to keep airplane within IFR parameters. Solution: learned more about airplane performance capabilities. In the future, I know there will be sits that will catch me by surprise, and as always I will aviate, navigation, and communicate. But the next time I communicate in such a situation I will state exactly what I need. 'Center 150 KTS is too slow, I need lower immediately to increase airspeed and return to altitude.'

Original NASA ASRS Text

Title: SA226 ENCOUNTERS ICE AND IS UNABLE TO MAINTAIN REQUESTED SPD AND ALT SE OF BURLEY, ID.

Narrative: COPLT FLYING. ACFT AT 17000 FT, 180 KTS, FULL PWR, AND LIGHT RIME ICE ON WINGS. CTR REQUESTS 150 KTS. COPLT REDUCES PWR AND AT 150 KTS COPLT INCREASES PWR. AIRSPD SLOWS TO 140 KTS AND BEGINS TO DSND. FULL PWR APPLIED, NO INCREASE IN AIRSPD ACFT CONTINUES DSCNT. AT 200 FT BELOW ALT CAPT REQUESTS BLOCK ALT BUT DOES NOT SPECIFY ALT. 300 FT BELOW ALT CAPT INFORMS CTR UNABLE 150 KTS AND 17000 FT. AT 16600 FT AIRPLANE ACCELERATES TO 160 KTS AND CLBS BACK TO 17000 FT. PROB: 1) CAPT DID NOT KNOW ACFT PERFORMANCE CAPABILITIES IN THIS ENVIRONMENT. 2) CAPT UNABLE TO COMMUNICATE CLRLY WITH CTR AHEAD OF TIME TO KEEP AIRPLANE WITHIN IFR PARAMETERS. SOLUTION: LEARNED MORE ABOUT AIRPLANE PERFORMANCE CAPABILITIES. IN THE FUTURE, I KNOW THERE WILL BE SITS THAT WILL CATCH ME BY SURPRISE, AND AS ALWAYS I WILL AVIATE, NAV, AND COMMUNICATE. BUT THE NEXT TIME I COMMUNICATE IN SUCH A SIT I WILL STATE EXACTLY WHAT I NEED. 'CTR 150 KTS IS TOO SLOW, I NEED LOWER IMMEDIATELY TO INCREASE AIRSPD AND RETURN TO ALT.'

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.

SA226 encounters ice and is unable to maintain requested speed and altitude southeast of burley, identification.