<< >> NASA ASRS Report 600557, November 2003

A B737-300 on approach descending from 9500 ft lost 'a' system hydraulics pressure and quantity. Fluid lost at 'a' system pressure module.

Attributes
ACN	600557
Time
Date	200311
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : zzz.vor
State Reference	US
Altitude	msl single value : 9500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 11400 flight time type : 530
ASRS Report	600557
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : 'a' pres + qty indication other flight crewa other flight crewb
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Loss of 'a' system hydraulic on approach to ZZZ. Performed QRH items. Declared an emergency. Briefed the cabin crew for a precautionary landing. The landing was performed without incident. We were then towed to the gate. Callback conversation with reporter revealed the following information: the reporter stated the loss of 'a' hydraulic system was caused by a massive leak on or in the 'a' system pressure module located on the forward main wheel well left side.

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Original NASA ASRS Text

Title: A B737-300 ON APCH DSNDING FROM 9500 FT LOST 'A' SYS HYDS PRESSURE AND QUANTITY. FLUID LOST AT 'A' SYS PRESSURE MODULE.

Narrative: LOSS OF 'A' SYS HYD ON APCH TO ZZZ. PERFORMED QRH ITEMS. DECLARED AN EMER. BRIEFED THE CABIN CREW FOR A PRECAUTIONARY LNDG. THE LNDG WAS PERFORMED WITHOUT INCIDENT. WE WERE THEN TOWED TO THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF 'A' HYD SYS WAS CAUSED BY A MASSIVE LEAK ON OR IN THE 'A' SYS PRESSURE MODULE LOCATED ON THE FORWARD MAIN WHEEL WELL L SIDE.

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.