Responsible for Heater Failure?

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WB_FlashOver
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Responsible for Heater Failure?

Post by WB_FlashOver »

Question about heater failures. Two times now I've had heater failures and both times it said I was "partially responsible". Now, the first time I believe I was partially responsible sense I shifted the blowers to low at about 19,000 during my decent. My Bad!

This time however I was FL200, 25.5 MP, 1775 RPM, 135 PSI +/- BMEP, Blowers in High, FE had control of everything except blowers, Blowers were shifted to High at 12,000-13,000 on ascent as I always do.

Am I missing something here or is this statement "You were partially responsible" just something that I need to except. I'm sure it effects my advancement when I am at fault but to what degree? I do have 530 hours on the old girl with two heater issue during that time. If I need to change my procedures it would nice to know.

Cheers and thanks
Roger
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flapman
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Re: Responsible for Heater Failure?

Post by flapman »

Your decision to shift blowers should have no effect on the heating of the cabin in flight. Engine supercharging is a separate system from the cabin superchargers, which are driven by the accessory gearbox of the outboard engines. The gear ratio of the engine superchargers is not related.

Cabin heating is provided by two combustion heaters located in the outboard nacelles. These burn fuel vapor from the induction system of the outboard engines. I don't know why you got the error, but blower ratio should have no relationship.

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Re: Responsible for Heater Failure?

Post by WB_FlashOver »

flapman, thanks for the reply. And yes, I was confusing the engine superchargers with the heater superchargers. This makes me even more curious about how the pilot/captain can effect the function of the heating system short of turning it off or switching the heater superchargers during flight.

Hmmmm? :?:

Cheers
Roger
-- Fly Well, Be Nice, Have Fun ! ! !

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flapman
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Re: Responsible for Heater Failure?

Post by flapman »

You should be fine to just leave the heater on after takeoff. It's control is automatic, or at least the flight attendant has fine control over cabin temp. I found that having the Pressurization Master, Heater, and both Supercharger switches on solves my temperature problems after takeoff (when I'm climbing into cool air).

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WB_FlashOver
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Re: Responsible for Heater Failure?

Post by WB_FlashOver »

Everything was fine for the climb and 60 minutes of level flight. Then it failed and I was blamed. I'd like to know what I did. "But what did I Do?" as my nephew would say.

Cheers
Roger
-- Fly Well, Be Nice, Have Fun ! ! !

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flapman
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Re: Responsible for Heater Failure?

Post by flapman »

Weird, I went for 4 hours with no problem. Did you make a descent into warmer air? Or did you remain at altitude as the cabin got progressively colder?

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WB_FlashOver
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Re: Responsible for Heater Failure?

Post by WB_FlashOver »

flapman wrote:Weird, I went for 4 hours with no problem. Did you make a descent into warmer air? Or did you remain at altitude as the cabin got progressively colder?
I started a 1200 FPM decent from FL200 (-21C OAT) as the cabin temp was dipping rapidly below 18C. By the time I got to 5,000 feet above field altitude (10,000 ASL) the cabin temp was 8C but started warming up again as the OAT was nearing 13C on approach and 18C on the ground at 5,100 ft. There are lot's of ridges and peaks nearing 8,000 ft in the area of KEKO so I couldn't go much lower and just flew the valleys into the field.

It was a good test and I enjoyed the challenge.

Roger
-- Fly Well, Be Nice, Have Fun ! ! !

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Tomas Linnet
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Re: Responsible for Heater Failure?

Post by Tomas Linnet »

I had a heater failure on one of my first flights just after takeoff. I landed within 10 minutes. Notes said I was not to blame. Not sure how COTS calculates this, but it could be something about the time it takes to land??
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