SDR PCAA0207083

Service difficulty report · O-Ring · Dhav DHC8102

Difficulty date: July 31, 2002
Submitted: August 6, 2002
Operation: Air carrier
Aircraft: N810EX
Make and model: Dhav DHC8102
Aircraft serial: 308
Aircraft time: 26,921 hours, 29,887 cycles
System (JASC): 2910 · Hydraulic System, Main
Part: O-Ring
Condition: Damaged
Location: Hyd System
Stage of operation: NR
How discovered: O
Nature of condition: K
Precautionary procedure: O

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

What was found

PHL - FLIGHT 3957 CREW REPORTED NR 2 HYDRAULIC CONTENTS DROPPED TO ZERO AND NR 2 HYDRAULIC PRESSURE DROPPED TO ZERO AFTER 5 MINUTES IN FLIGHT. NO PRESSURE FOR 10 MINUTES. MAINTENANCE INSPECTED NR 2 HYDRAULIC PUMP AND FOUND O-RING ON PRESSURE UNION DAMAGED. CASE DRAIN FILTERS WERE ALSO INSPECTED, WITH NO DEFECTS NOTED. O-RING WAS REPLACED. GROUND RUN-UP GOOD. NO LEAKS FOUND. AIRCRAFT RETURNED TO SERVICE.