squawk_box

Passing The Ride

Expecting that I had somehow unknowingly blown my check ride, we landed, shut everything down and he informed me I had...well...passed! A bit confused but obviously glad I hadnt actually blown it, I accepted the good news not wishing to open my mouth and undo it, and simply thanked him. I never told my instrument instructor what the examiner had said, only that he passed me.

Odds And Ends

This issue likely will hit your mailbox just before the Sun n Fun International Fly-In Expo in Lakeland, Fla. The annual event informally kicks off each years air show season, and 2019 will be no different. If you plan to attend SnF or any other fly-in event (cough, EAA AirVenture, cough), youre not alone. In fact, thousands of your closest friends are planning the same thing, and well all want to arrive and depart at more less the same time.

Hosed

Engine began running rough in cruise, the pilot diverted and the aircraft was landed without damage. Investigation found the fuel line between the fuel flow transducer and fuel flow divider was loose at the flow divider. Although it seems unlikely, the aircraft operator has to consider the possibility that this fuel line came loose by itself in the five days and 23 hours of flying since the last scheduled inspection....

Exhaust Essentials

The first order of business in the inspection process is to become familiar with the specific exhaust system and components so that the aircraft is maintained in the desired condition. As always, the place to start is the manufacturers maintenance and parts manuals. This is also true when considering an aftermarket exhaust system, including turbochargers, typically installed according to a supplemental type certificate (STC). Aftermarket exhaust and turbocharger providers like Power Flow and Tornado Alley Turbo offer documentation at least as good as the airframe manufacturers, including installation instructions, parts manuals and instructions for continued airworthiness.

Shut Down

The recent partial shutdown of the U.S. federal government had a far-reaching impact on aviation, thanks to its parent Department of Transportation (DOT) being one of the agencies lacking an enacted appropriations bill for the current fiscal year. Since related agencies are tacked onto DOT spending bills, the NTSB also closed for the duration, delaying ongoing investigations and postponing new ones. (Our monthly listing of preliminary accident reports might look a bit strange until the NTSB has caught up with the backlog.)

Control System Servos

At FL400, the autopilot started porpoising and was turned off. Afterward, the aircraft would not trim properly. The crew diverted; it was difficult to keep it pitched down while descending. During the final phase of flight, the yoke was very difficult to input pitch changes, but was okay in the roll axis. After landing, troubleshooting duplicated the problem. Elevator servo (p/n 4006719914) was replaced with serviceable unit.

Brake Master Cylinders

After a brake master cylinder was installed, the technician was unable to bleed the brake system. Fluid pulled from reservoir would return to reservoir through the same line as the internal bypass was not functioning properly. Master cylinder was disassembled and bypass was found stuck and unable to move. Metal shavings were found inside, and an O-ring was torn, with black specks mixed in with the shavings. Part replaced with new master cylinder.

No Checklist For This

I was flying a 2002-model A36 Bonanza (yeah, with me its always a Bonanza) home to Wichita from Thanksgiving in Ohio with my wife and our son aboard. Somewhere over Indiana, the Bonanzas attitude indicator (AI) began to tumble. The failure announced itself slowly, but very soon the instrument was pitching up and down in very distracting oscillations. It then displayed a range of indications-from off-scale nose-up pitch excursions to slightly below 20 degrees nose-down-in a roughly two-second cycle, while indicating bank angles between wings-level and about 10 degrees left.

Turbochargers

During descent, pilot noted oil streaking back from top engine cowl louvers, then dropping oil pressure. Pilot conducted precautionary shutdown and feathered propeller. Pilot continued descent and landed at destination without issue. Maintenance removed cowling and found oil appearing to come from the turbocharger (p/n 4066109025) area. Further investigation revealed oil bypassing the seals on the turbo.

Oil Filters

Following a scheduled oil and filter change, the technician noted lower-than-normal oil pressure at idle. The new filter (p/n CH48110-1) was replaced and oil pressure indication was normal. Examination of the replaced filter noted some paint chips had been removed in the flange area. The submitter suspects that a paint chip could have contaminated the filter, causing it to go into bypass. These filters are packaged in cardboard boxes. There was no damage noted to the box containing the filter.

Unregulated

When the aircraft is equipped with VR-1010-24-1A regulators allowed by Service Instruction 0766-354, Rev II, the overvoltage testing procedure is not achievable. The solid-state voltage regulators are not adjustable to a range (over 31.5v) that will adequately test the overvoltage relays. During a ground run and adjustment of the new voltage regulators, one failed and caused an overvoltage condition. It is this technicians opinion that the test procedure for the overvoltage relay should be changed to include removing and bench testing the overvoltage relays.

Bad Yokes

During a scheduled inspection, technicians encountered corroded and bent control yoke boss attachment hardware that proved difficult to remove. After consulting with the manufacturer, the final recommendation was to remove the boss via cutting the bolts (p/n 2315152-33). Manufacturer was able to repair the yoke assembly using SB 31-27-11 and kit 2381602-801. Aircraft had been parked outside without gust locks.