CHT Gauge Required?

Blackhawk

Blackhawk

Well-Known Member
This came up today. Is it required in a 182 or similar airplane with cowl flaps? What's the reference? No IAs or A&Ps.
 
I don't have any references other than the fact a FAA inspector told me once that CHT gauge is required when operating an airplane with cowl flaps.
 
Inverted25 said:
I don't have any references other than the fact a FAA inspector told me once that CHT gauge is required when operating an airplane with cowl flaps.
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I've known FAA inspectors to be wrong... not that the one you talked to was. We had the same thing today... an FAA inspector (also an A&P), knew it was required, but it took him, a DE and myself about 45 minutes to figure out why. Anyone relying on TOMATOFLAMES would fly an un-airworthy airplane.
 
Ive been flying high performance planes for a long time. This is the first I've ever heard of this.

Maybe it's just never came up Over the years.
 
Blackhawk said:
This came up today. Is it required in a 182 or similar airplane with cowl flaps? What's the reference? No IAs or A&Ps.
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Check the POH. In the required equipment list it may say a CHT gauge has to be working. I know in the diamond DA-20 it required the EGT to be operational.

Now in the real world, I would be hesitant to close the cowl flaps in any airplane without a working CHT gauge.
 
I am pretty sure it isn't in the FAR's. But if it is in the MEL for the operator then yes it is required.
 
I remember the inspector who told me about it said it had to do with the airplanes type certificate which doesn't make much sense to me. But I second the fact that it is under the required equipment in the poh
 
I'd never heard of that before, but it makes sense.

Where did the FAA inspector find the reason why it's required? All I can think of is that it would appear somewhere in the regulations specifying certification requirements for airplanes or it's in the "required equipment" portion of the POH.
 
I like when someone just tells you youre wrong but doesn't provide any other information as to why so we can all understand
 
7700 said:
I like when someone just tells you youre wrong but doesn't provide any other information as to why so we can all understand
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It's in the FARs and applies to ALL reciprocating engines with cowl flaps. Not trying to be a jerk, but really wanted to see how many CFIs thought of looking in the specific FAR or just rely on TOMATOFLAMES.
 
91.213 requires all installed equipment to be working prior to beginning a flight, 91.205 is just required equipment for airworthiness certification
 
ndakcfi said:
I'd never heard of that before, but it makes sense.

Where did the FAA inspector find the reason why it's required? All I can think of is that it would appear somewhere in the regulations specifying certification requirements for airplanes or it's in the "required equipment" portion of the POH.
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That's where it is. FAR 91.213 says we can not fly with inoperative equipment that is "Part of the VFR-day type certification instruments and equipment prescribed in the applicable airworthiness regulations under which the aircraft was type certificated". That's part 23.
23.1305 Powerplant instruments.

(b) For reciprocating engine-powered airplanes. In addition to the powerplant instruments required by paragraph (a) of this section, the following powerplant instruments are required:
(3) A cylinder head temperature indicator for—

(i) Each air-cooled engine with cowl flaps;

(ii) [Reserved]

(iii) Each commuter category airplane.
Kind of interesting. I assume this was a requirement under CAR Part 3 as well. So an airplane with an augmenter tube such as a 310K would not need a CHT gauge. An airplane with the same engine, but cowl flaps, would need a CHT gauge.
 
I wouldn't rely on TOMATOFLAMES, but I wouldn't look in the FARs if I were in that situation either. I'd go straight to the POH as mentioned earlier.
 
7700 said:
91.213 requires all installed equipment to be working prior to beginning a flight, 91.205 is just required equipment for airworthiness certification
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No, it does not.
"(d) Except for operations conducted in accordance with paragraph (a) or (c) of this section, a person may takeoff an aircraft in operations conducted under this part with inoperative instruments and equipment without an approved Minimum Equipment List provided—

(1) The flight operation is conducted in a—

(i) Rotorcraft, non-turbine-powered airplane... etc."
 
JLF said:
I wouldn't rely on TOMATOFLAMES, but I wouldn't look in the FARs if I were in that situation either. I'd go straight to the POH as mentioned earlier.
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Another good example is carb heat. Won't find in POH, but it's in FAR 23.
 
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