Squawk Box

February 2017 Issue




Fuel Injectors

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

Contamination
Cessna Model 310R

The pilot reported a rough-running engine and made a precautionary landing. The technician found small amounts of dirt in the injectors of the affected cylinders. Injectors were cleaned and lines removed, flushed and reinstalled. Fuel transducers had been installed in the fuel lines as part of an engine monitor installation approximately five flight hours prior to this occurrence.

Part total time: 40.0 hours

aircraft fuel injector

Broken I
Cirrus SR22

During takeoff, the pilot noticed the engine was running rough and returned to the airport for landing. A technician cleaned spark plugs and test-ran the aircraft; no abnormalities noted. Pilot test-flew the aircraft, which started running rough again. The landing was uneventful. Subsequent inspection found the number one cylinder’s fuel injector broken in half.

Part total time: 23.0 hours

Broken II
Cirrus SR22

During flight, the fuel injector broke in half. One portion was in the number one cylinder with the other still attached to the fuel line from the spider. Luckily there was no fire.

Part total time: 526.0 hours

Plugged
Piper PA-31-350 Navajo Chieftain

Just after takeoff, the pilot noticed reduced power on the right engine. The pilot returned and landed safely. Inspection found number two and number six fuel injectors plugged. The injectors were cleaned and reinstalled, the engine ground run and the aircraft returned to service.

Part total time: Unknown

Foreign Matter
Piper PA-31-350 Navajo Chieftain

During takeoff, the left engine failed to develop full power. Inspection revealed small unknown foreign debris in the cylinders one, three and five fuel injector nozzles. Fuel control unit screen was inspected with no debris found inside. Fuel lines inspected with no debris inside. All left-engine fuel injectors were replaced.

Part total time: Unknown

Loose Plug
Piper PA-28RT-201 Turbo Arrow IV

During post-crash investigation, a brass plug on the fuel injector servo (model RSA-5AD1, p/n 2524297-10, s/n 55603 with a repair facility o/h stamp) was found popped out of the fuel injector servo, with its safety wire still attached. This servo was aboard the aircraft at the time of the accident. The aircraft was a total loss.

Part total time: 2350.0 hours