20121027023439I

Incident · No damage

FAA incident report · Dehavilland DHC-6 Twin Otter · Wainwright, AK · October 27, 2012

Date
October 27, 2012 · 15:17 local
Place
Wainwright, AK
Phase of flight
Cruise/Level Flight
Operating rules
Air taxi and commuter (Part 135)
Operator
YQPA
Damage
No damage
Aircraft
N716JP
Reported as
Dehavilland DHC-6 Twin Otter
Reported engine
Pratt & Whitney PT6A-28
People aboard
2
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Airline transport
Pilot’s flight hours
15,000 total2,500 in this make and model108 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

The operator was conducting survey operations which require the aircraft to be flown at a specfic speed and altitude. The pilot was in the process of slowing down the aircraft by lowering the flaps and maintaining the proper altitude and air speed to perform the survey. Subsequently, the pilot noticed the nose of the aircraft was heavy after he had positioned the flaps about 10 degrees to maintain the correct air speed. The pilot began to make a visual sweep of the aircraft instruments and noticed the flap indicator indicated 10 degrees, however the hydraulic pump pressure gauge was reading zero. The pilot initiated emergency procedures and deactivated the appropriate circuit breaker and used the hydraulic hand pump to lower the flaps and landed at Wainwright without further incident. Pilot in right seat (A&P) contacted his director of maintenance for instructions. Trouble shot the system according to the manufacturer's procedures and could not duplicate the failure. PIC entered the appropriate discrepancy into the flight log and the appropriate corrective action and the aircraft was returned to service.

As the FAA filed it

THE OPERATOR WAS CONDUCTING SURVEY OPERATIONS WHICH REQUIRE THE AIRCRAFT TO BE FLOWN AT A SPECFIC SPEED AND ALTITUDE. THE PILOT WAS IN THE PROCESS OF SLOWING DOWN THE AIRCRAFT BY LOWERING THE FLAPS AND MAINTAINING THE PROPER ALTITUDE AND AIR SPEED TO PERFORM THE SURVEY. SUBSEQUENTLY, THE PILOT NOTICED THE NOSE OF THE AIRCRAFT WAS HEAVY AFTER HE HAD POSITIONED THE FLAPS ABOUT 10 DEGREES TO MAINTAIN THE CORRECT AIR SPEED. THE PILOT BEGAN TO MAKE A VISUAL SWEEP OF THE AIRCRAFT INSTRUMENTS AND NOTICED THE FLAP INDICATOR INDICATED 10 DEGREES, HOWEVER THE HYDRAULIC PUMP PRESSURE GAUGE WAS READING ZERO. THE PILOT INITIATED EMERGENCY PROCEDURES AND DEACTIVATED THE APPROPRIATE CIRCUIT BREAKER AND USED THE HYDRAULIC HAND PUMP TO LOWER THE FLAPS AND LANDED AT WAINWRIGHT WITHOUT FURTHER INCIDENT. PILOT IN RIGHT SEAT (A&P) CONTACTED HIS DIRECTOR OF MAINTENANCE FOR INSTRUCTIONS. TROUBLE SHOT THE SYSTEM ACCORDING TO THE MANUFACTURER'S PROCEDURES AND COULD NOT DUPLICATE THE FAILURE. PIC ENTERED THE APPROPRIATE DISCREPANCY INTO THE FLIGHT LOG AND THE APPROPRIATE CORRECTIVE ACTION AND THE AIRCRAFT WAS RETURNED TO SERVICE.

Other reports on N716JP · 1

Matched to the same aircraft by N-number and date.