SDR 97ZZZX2056

Service difficulty report · Prop Control · Dhav DHC4A

Difficulty date: January 19, 1997
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N702SC
Make and model: Dhav DHC4A
Aircraft serial: 126
System (JASC): 6120 · Propeller Controlling System
Part: Prop Control
Condition: Malfunctioned
Location: Rt Engine
Stage of operation: CR
Nature of condition: O
Precautionary procedure: E, A

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

What was found

WHILE IN CRUISE FLIGHT FROM ANIAK AT CRUISE POWER (30 INCH MANIFOLD PRESSURE, 2100 RPM, AUTO LEAN), THE RPM ON THE RIGHT ENGINE SUDDENLY CLIMBED FROM 2100 RPM TO APPROXIMATELY 3700 RPM OR 6 O'CLOCK. PILOT RETARDED THE THROTTLE FOR THAT ENGINE AND FEATHERED THE RIGHT PROPELLER, THE PROPELLER FEATHERED. PILOT AND COPILOT DECIDED TO MAKE AN EMERGENCY LANDING AT THE SPAREVON RUNWAY (USAF). AIRCRAFT COULD NOT MAINTAIN ALTITUDE DUE TO SEVERE TURBULENCE AND AIRCRAFT CRASHED.