pjvr99

TCTO refers to immediate removal from service of all 54H60 propellers having blade serial number less than 813320. These propellers are to be sent for overhaul and blade replacement.

thank you Paolo, have you checked the oil tank for contamination or blockage? also check the oil supply hose (flexible) from tank for collapsing. If it only cuts out under load, you may have a fuel starvation problem - take a look at the fuel filter on the fuel cluster and also the filter up in the wheel well just out of curiousity, is the APU part no 381116-1-() or 381116-3?

As NATOPS1 asks, can the APU be restarted immediately or do you need to wait for a time? Likely causes can be oil pressure, load control/acceleration thermostat, faulty overspeed solenoid, or some electrical interruption. If you have an APU test stand available, I would recommend running the APU there and try to duplicate the problem.

TD valve brake binding by the sound of it

assuming you have already swapped guages, so i would then shoot TIT from the firewall using TD tester, and bumping the TIT wires all the way to the cockpit. Next step would be to check power wires to the guage, and also whether it is grounded properly.

Ok was just curious. Gonna go out on a limb here because we had something similar last year. Try replacing flexible oil hoses to and from the oil tank, and make sure the rigid lines and the tank are clean and free of contaminants

what is part number for this APU?

ok. sounds like you got the important bits. when you started troubleshooting, did you set cracking 57 - 63psi? did you remove the control air line from fuel cluster while setting cracking pressure? Have you changed the acceleration/load control thermostat?

you didnt mention replacing aux start relay and fuel holding relay. try that. also try replacing 110% overspeed solenoid on back of apu. back to ignitor: can you hear it firing?

Is the ignitor firing? are you getting fuel from exhaust?

Hey guys Wondering if anyone can help me with info on the N prefix on the blade serial numbers. We have just gotten a TCTO covering a number of blades. Some of the serials are N8xxxxx others are just 8xxxxx. What does the N refer to ..... Tnx in advance PJ

speed valve stuck closed, bleed valves not opening

Cutback is a misleading term, as the TIT before correction may be lower than corrected TIT. For example, TIT before light out may be 790°C and 835°C after light out. There was an increase rather than a cutback. AGAIN, there is NO limit for TIT before light out, only 800 to 840 after light out.

As a follow-up to this, we had one a few weeks back that actually went over a 1000°C before cutting back to 830 or so. Found the fcu schedule had shifted rich, adjusted CIT, and everything went back to where we expected it .....

For several weeks flight and ground crews have been pecking away at a problem where engine torque, fuel flow and TIT increase when engine anti-icing is turned on. We're not talking 100"lbs of torque here, its over 4000"lb and/or 300 to 500 pph of fuel. Every conceivable component from FCU, speed valve, anti-icing side valves, and the whole TD system has been replaced at least once with no change. Last week the engine was finally removed and sent to test cell. Engine was started, runs great, makes good power, but when anti-icing is turned on there is a massive surge of torq and fuel which the TD barely contains. I had the to see what happens in NULL - instant soil-the-underwear moment as torq jumps from 12500"lb to almost 18000"lb, fuel goes 1600pph to 2000pph, and TIT from 900°C to 1040° ...... I have a small flapper installed over the inlet duct anti-icing vent so we can see when the anti-icing valve opens. This device was working as intended, meaning a/icing on flapper flaps, but ...... massive torq, TIT and FF increases. We eventually shut down the engine without any real idea of how to proceed with troubleshooting. Then I started thinking: what if, somehow, a/icing air is getting into the FCU CIT or CIP lines .... Some examination of diagrams led me to the CIP inlet in the compressor inlet housing. A/icing air is pumped into the same strut as the CIP fitting. If the fitting is corrode, cracked or loose, you'd be dumping 100psi air onto the CIP bellows. Long story short, a really skinny guy was sent up the 'S'-duct and CIP fitting was replaced. VOILA! A/icing no longer causes massive increases in torq, ff, and TIT

Looks like the old 1C-130H-2-4 manual. It has some really interresting graphs, although i dont remember anything to do with bleed air in it

1C-130H-2-76JG-00-1

https://www.ilsmart.com/Aviation/part/6798233.htm Part number 6798233

2 things will happen here: 1- you will lose the commercial (civilian) certification for the D22 2- you will have no fuel flow indication. The T56 engine uses a 28v DC power supply for the ff transmitter and indicators, while the D22 uses a 115v 400hz power supply. The wiring and connectors are completely different. In my opinion this would be a completely wasted excercise, not to mention the expense of recertifying the D22 again

engine core or complete QEC?

Probably want to keep APU shut down when taxing on dirt or unprepared strips. Having said that, the intake screen holes are big enough to let in small gravel and stones which can and will damage the compressor when it is started again ....

no problem, this is how we all learn

Another thought, pull off the compressor rear bearing vent lines and check for oil - the lines are normally dry

OK. big scavenge problem. How is oil temperature? Pull off lower E-duct from 14th stage. check the #2 & #3 bearing lines visible for oil staining. After that check #2 & #3 bearing lines to the external scavenge pump that they are not blocked. Heve you changed main oil pump yet?

What is the difference in indicated oil quantity with engine running at 100% rpm and indicated oil qty immediately when engine is shut down (no rotation)? During ascent/descent are the oil pressures steady, or is there a fluctuation? Is there any fluctuation on the ground? Did the engine go across test cell before going back to aircraft?