Jet trainer pilot landed the aircraft gear up after the aircraft hydraulic system failed. The pilot did not do a proper preflight inspection of the aircraft.

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Attributes
ACN	607925
Time
Date	200402
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Military Trainer
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 18700 flight time type : 150
ASRS Report	607925
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	aircraft equipment problem : critical ground encounters : gear up landing non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance controller : provided flight assist
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While on a local proficiency flight, I returned to the airport area for landing to find I had no hydraulic system. Both gear and flaps are hydraulically pwred. After doing all the troubleshooting I could, I referred to the emergency procedure to extend the gear by accumulator pressure. Unfortunately, the system fluid was gone and the procedure did not work. The aircraft was successfully 'bellied in.' there were no injuries, and the airplane suffered only minor damage. Later investigation showed that the hydraulic reservoir cap had blown out of the filler neck. Apparently, it had vibrated free. The hydraulic filler on this aircraft is very difficult to reach and is obstructed by several cable bundles making the complicated cap difficult to secure properly. I put the primary cause of this mishap down to improper preflight. I take the blame for this act of complacency. I had never had trouble with the hydraulic cap in the past, and didn't really think this was a vulnerability. Guess I was wrong!

Original NASA ASRS Text

Title: JET TRAINER PLT LANDED THE ACFT GEAR UP AFTER THE ACFT HYD SYS FAILED. THE PLT DID NOT DO A PROPER PREFLT INSPECTION OF THE ACFT.

Narrative: WHILE ON A LCL PROFICIENCY FLT, I RETURNED TO THE ARPT AREA FOR LNDG TO FIND I HAD NO HYD SYS. BOTH GEAR AND FLAPS ARE HYDRAULICALLY PWRED. AFTER DOING ALL THE TROUBLESHOOTING I COULD, I REFERRED TO THE EMER PROC TO EXTEND THE GEAR BY ACCUMULATOR PRESSURE. UNFORTUNATELY, THE SYS FLUID WAS GONE AND THE PROC DID NOT WORK. THE ACFT WAS SUCCESSFULLY 'BELLIED IN.' THERE WERE NO INJURIES, AND THE AIRPLANE SUFFERED ONLY MINOR DAMAGE. LATER INVESTIGATION SHOWED THAT THE HYD RESERVOIR CAP HAD BLOWN OUT OF THE FILLER NECK. APPARENTLY, IT HAD VIBRATED FREE. THE HYD FILLER ON THIS ACFT IS VERY DIFFICULT TO REACH AND IS OBSTRUCTED BY SEVERAL CABLE BUNDLES MAKING THE COMPLICATED CAP DIFFICULT TO SECURE PROPERLY. I PUT THE PRIMARY CAUSE OF THIS MISHAP DOWN TO IMPROPER PREFLT. I TAKE THE BLAME FOR THIS ACT OF COMPLACENCY. I HAD NEVER HAD TROUBLE WITH THE HYD CAP IN THE PAST, AND DIDN'T REALLY THINK THIS WAS A VULNERABILITY. GUESS I WAS WRONG!

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.