<< >> NASA ASRS Report 499837, January 2001

A fokker 100 dispatched with 1 inoperative engine bleed system had failure of the operative bleed system incurring loss of cabin pressure.

Attributes
ACN	499837
Time
Date	200101
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : clt.airport
State Reference	NC
Altitude	msl single value : 11200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc tower : cle.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : shine 5
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 155 flight time total : 14450 flight time type : 1500
ASRS Report	499837
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin pressure indication other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Maintenance Human Performance Flight Crew Human Performance Aircraft Environmental Factor
Primary Problem	Aircraft

Narrative:

One bleed was on MEL. Descending through approximately 11200 ft, cabin altitude warning appeared on the MFDU. Aircraft was descended immediately below 10000 ft. Cabin altitude matched aircraft altitude. Bleed pressure was indicating 2 psi, regardless of throttle position. Pressurization had worked normally after takeoff. Aircraft was written up and removed from service. Fortunately, this happened at a low enough altitude that an increase in descent rate remedied the situation quickly.

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Original NASA ASRS Text

Title: A FOKKER 100 DISPATCHED WITH 1 INOP ENG BLEED SYS HAD FAILURE OF THE OPERATIVE BLEED SYS INCURRING LOSS OF CABIN PRESSURE.

Narrative: ONE BLEED WAS ON MEL. DSNDING THROUGH APPROX 11200 FT, CABIN ALT WARNING APPEARED ON THE MFDU. ACFT WAS DSNDED IMMEDIATELY BELOW 10000 FT. CABIN ALT MATCHED ACFT ALT. BLEED PRESSURE WAS INDICATING 2 PSI, REGARDLESS OF THROTTLE POS. PRESSURIZATION HAD WORKED NORMALLY AFTER TKOF. ACFT WAS WRITTEN UP AND REMOVED FROM SVC. FORTUNATELY, THIS HAPPENED AT A LOW ENOUGH ALT THAT AN INCREASE IN DSCNT RATE REMEDIED THE SIT QUICKLY.

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.