F-100 suffers loss of its #1 primary hydraulic system.

Attributes
ACN	263415
Time
Date	199402
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 2000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : ewr
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other landing other
Route In Use	enroute airway : n90
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 11000 flight time type : 1000
ASRS Report	263415
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 280 flight time total : 6000 flight time type : 2000
ASRS Report	263125
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On final letdown and initial approach into ewr, we lost hydraulic system #1 hydraulics which is our main hydraulic system. Requested approximately a 20 mi final from ewr approach to accomplish appropriate procedures. Used manual gear extension and alternate flaps. Advised ewr tower that we would not have any nosewheel steering and that we would be stopping on runway 22L with our gear doors hanging down. Called out emergency equipment as a precaution. Landing was uneventful. Stopped on runway and was towed to gate by company. Supplemental information from acn 263125: problem found to be o-ring on pump outlet broken (#2 engine). We were unsure as to how long pumps ran after failure, probably less than 2 mins. Why does #1 hydraulic system depend solely on 1.25 cent o-ring?

Original NASA ASRS Text

Title: F-100 SUFFERS LOSS OF ITS #1 PRIMARY HYD SYS.

Narrative: ON FINAL LETDOWN AND INITIAL APCH INTO EWR, WE LOST HYD SYS #1 HYDS WHICH IS OUR MAIN HYD SYS. REQUESTED APPROX A 20 MI FINAL FROM EWR APCH TO ACCOMPLISH APPROPRIATE PROCS. USED MANUAL GEAR EXTENSION AND ALTERNATE FLAPS. ADVISED EWR TWR THAT WE WOULD NOT HAVE ANY NOSEWHEEL STEERING AND THAT WE WOULD BE STOPPING ON RWY 22L WITH OUR GEAR DOORS HANGING DOWN. CALLED OUT EMER EQUIP AS A PRECAUTION. LNDG WAS UNEVENTFUL. STOPPED ON RWY AND WAS TOWED TO GATE BY COMPANY. SUPPLEMENTAL INFO FROM ACN 263125: PROB FOUND TO BE O-RING ON PUMP OUTLET BROKEN (#2 ENG). WE WERE UNSURE AS TO HOW LONG PUMPS RAN AFTER FAILURE, PROBABLY LESS THAN 2 MINS. WHY DOES #1 HYD SYS DEPEND SOLELY ON 1.25 CENT O-RING?

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.