CL60 flight crew has no brakes or steering on landing.

Attributes
ACN	662589
Time
Date	200506
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 : corporate
Make Model Name	Challenger CL601
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 412
ASRS Report	662589
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	faa : investigated other
Factors
Maintenance	performance deficiency : testing performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

I was the PIC of a challenger 601 on a flight from ZZZ1 to ZZZ. The approach to runway 29 was stable with a normal touchdown at the threshold. I deployed speed brakes and thrust reversers. When I applied the wheel brakes I discovered I had none. I asked the first officer to apply his wheel brakes. He responded he had no brakes. I continued slowing using reversers. When I tried to steer using the nosewheel steering tiller; I got no response. When slowed to approximately 4 KTS; I told the first officer to tell tower we would be shutting down on the runway. I shut down both engines and brought the plane to a complete stop on the centerline. Tower called a tug to tow us off. What happened? It appears the left main landing gear strut was over-svced with nitrogen. After landing and initial brake application; the left strut extended far enough to open the air/ground (called a weight on wheels) switch. The airplane thought it was in the air and deactivated the brakes and steering. We were lucky to get the reversers. The FAA is still investigating.

Original NASA ASRS Text

Title: CL60 FLT CREW HAS NO BRAKES OR STEERING ON LNDG.

Narrative: I WAS THE PIC OF A CHALLENGER 601 ON A FLT FROM ZZZ1 TO ZZZ. THE APCH TO RWY 29 WAS STABLE WITH A NORMAL TOUCHDOWN AT THE THRESHOLD. I DEPLOYED SPD BRAKES AND THRUST REVERSERS. WHEN I APPLIED THE WHEEL BRAKES I DISCOVERED I HAD NONE. I ASKED THE FO TO APPLY HIS WHEEL BRAKES. HE RESPONDED HE HAD NO BRAKES. I CONTINUED SLOWING USING REVERSERS. WHEN I TRIED TO STEER USING THE NOSEWHEEL STEERING TILLER; I GOT NO RESPONSE. WHEN SLOWED TO APPROX 4 KTS; I TOLD THE FO TO TELL TWR WE WOULD BE SHUTTING DOWN ON THE RWY. I SHUT DOWN BOTH ENGS AND BROUGHT THE PLANE TO A COMPLETE STOP ON THE CTRLINE. TWR CALLED A TUG TO TOW US OFF. WHAT HAPPENED? IT APPEARS THE L MAIN LNDG GEAR STRUT WAS OVER-SVCED WITH NITROGEN. AFTER LNDG AND INITIAL BRAKE APPLICATION; THE L STRUT EXTENDED FAR ENOUGH TO OPEN THE AIR/GND (CALLED A WT ON WHEELS) SWITCH. THE AIRPLANE THOUGHT IT WAS IN THE AIR AND DEACTIVATED THE BRAKES AND STEERING. WE WERE LUCKY TO GET THE REVERSERS. THE FAA IS STILL INVESTIGATING.

Data retrieved from NASA's ASRS site as of January 2009 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.