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Old 22nd Mar 2021, 11:42
  #30 (permalink)  
Pilot DAR
Join Date: Aug 2006
Location: Ontario, Canada
Age: 60
Posts: 4,852
Small GA airplanes historically were not furnished with minimum equipment lists, which the pilot should take to mean that everything must work, or the plane is not airworthy. For an airplane with no MEL, the only "give" I've seen on flying with something not working was U/S nav lights for day only flying. Otherwise, it's gotta work. If a pilot determines something is not working, it's up to them to record it as a snag. Though difficult for pilots to access, the old way for the manufacturer/regulator to describe required equipment, when there was doubt, is in the notes of the type certificate data sheet. It's not easy to find, but it is the pilot's responsibility to fly in accordance with its terms.

Using the 172 as an example:

From TCDS 3A12, page 16:

Equipment: The basic required equipment as prescribed in the applicable airworthiness requirements (see Certification
Basis) must be installed in the aircraft for certification. This equipment must include a current Airplane
Flight Manual effective S/N 17271035 and on.
1. Model 172 through 172G: Stall warning indicator, Dwg. 0511062.
2. Model 172H and on: Stall warning indictor, Dwg. 0523112.
And, in the POH for the 172S, page 6-20:

31-04-R Pneumatic Stall Warning System
[As "required"]

So there is no provision for the pilot to choose to fly with it inoperative. I agree that generally, pilots are not taught where to find this information, but it's there, and the pilot's responsibility to know....

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