SDR CA980406051

Service difficulty report · Tube · Dhav DHC7*

Difficulty date: March 30, 1998
Submitted: March 26, 2000
Operation: General aviation
Make and model: Dhav DHC7*
System (JASC): 2910 · Hydraulic System, Main
Part: Tube
Condition: Chafed
Location: Nr 2 Hyd Sys
Stage of operation: TX
Nature of condition: K, J
Precautionary procedure: H

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) AT THE END OF THE LANDING ROLL IT WAS NOTICED THAT NR 2 HYDRAULIC QUANTITY GAUGE WAS AT ZERO. THEN WHEN TAXIING ONTO RAMP, THE NR 1 HYDRAULIC PUMP FAILED. INVESTIGATION FOUND A HYDRAULIC LINE BADLY CHAFED WITH A SMALL HOLE ALLOWING NR 2 SYSTEM TO DRAIN MOST FLUID. IT IS BELIEVED THAT GEAR SELECTION AND LOWERING CAUSED THE CHAFED LINE TO FINALLY BURST.