An engine bleed problem causes enough distraction for an air carrier crew to miss a crossing restr.

Attributes
ACN	496980
Time
Date	200101
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : tarne
State Reference	IN
Altitude	msl bound lower : 11000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Route In Use	arrival star : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 270 flight time total : 3000 flight time type : 1500
ASRS Report	496980
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to original clearance
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Clearance to cross tarne intersection at 11000 ft. Descending through about 14000 ft, xferred air conditioning to APU. The 10TH stage bleed isolation valve failed to open properly and we were distraction while trying to correct the problem. We missed the crossing altitude. Just after tarne, we were at 13000 ft and discovered the problem. The captain quickly corrected the altitude to 11000 ft.

Original NASA ASRS Text

Title: AN ENG BLEED PROB CAUSES ENOUGH DISTR FOR AN ACR CREW TO MISS A XING RESTR.

Narrative: CLRNC TO CROSS TARNE INTXN AT 11000 FT. DSNDING THROUGH ABOUT 14000 FT, XFERRED AIR CONDITIONING TO APU. THE 10TH STAGE BLEED ISOLATION VALVE FAILED TO OPEN PROPERLY AND WE WERE DISTR WHILE TRYING TO CORRECT THE PROB. WE MISSED THE XING ALT. JUST AFTER TARNE, WE WERE AT 13000 FT AND DISCOVERED THE PROB. THE CAPT QUICKLY CORRECTED THE ALT TO 11000 FT.

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.