Old (early 70s) C172 questions
07-14-2011 | 06:48 AM
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Old (early 70s) C172 questions
I am doing some flying in a old Cessna 172. I think the year it was built was 1972. My first question is: is it normal for these aircraft to not have the normal V-speeds? It has green, yellow and white arcs as well as red mark on the airspeed indicator but I could not find things like Vx or Vy. Only thing I could find was "Climb between 72 and 80 miles per hour for the best rate" or "Climb at 64 mph for best angle" but it was never listed as Vx and Vy. Were Vspeeds something that came out later?
Also, we know in the acronym "ARROW" O is operating handbook/limitations. What year were aircraft not required to carry a POH?
If the aircraft has a STC (STOL kit installed), is that STC required to be carried in the aircraft?
Also, we know in the acronym "ARROW" O is operating handbook/limitations. What year were aircraft not required to carry a POH?
If the aircraft has a STC (STOL kit installed), is that STC required to be carried in the aircraft?
07-14-2011 | 08:07 AM
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The statement "Climb at 64 mph for best angle" does mean Vx. The POHs for those years do not specify on one page like the lattest models all the V speeds. V speeds existed then as they do now.
The Cessna manuals have evolved over there years and now provide more information than early 70s manuals.
The term POH is not a requirement in any Cessna because a Pilot Operating Handbook is not an AFM (Airplane Flight Manual). If a Cessna manual is required for a certain year it would be the AFM not POH. A POH is a reproduction of information from a AFM and is for pilot infromation only. It is not an FAA approved AFM.
Also the O in ARROW stands for Operating Limitaions only not "operating handbook/limitations".
The Cessna manuals have evolved over there years and now provide more information than early 70s manuals.
The term POH is not a requirement in any Cessna because a Pilot Operating Handbook is not an AFM (Airplane Flight Manual). If a Cessna manual is required for a certain year it would be the AFM not POH. A POH is a reproduction of information from a AFM and is for pilot infromation only. It is not an FAA approved AFM.
Also the O in ARROW stands for Operating Limitaions only not "operating handbook/limitations".
07-14-2011 | 02:31 PM
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FAA did not regulate Part 23 airplane documentation for pilots until the late 70's and since books cost money to make they were often of (very) poor quality. What you do find in these thin books is usually taken from certification testing. A few performance items were done in the service of product support but only a few. The 500+ page Skyhawk manuals we have today are the result of massive FAA regulatory influence.
As for the terms Vx and Vy, they do not originate with the CAA/FAA. They stem from aeronautical science going way back, I think it would be hard to find where the first use of the terms was found. Apart from the letters "Vx" and "Vy", the ideas they denote were in circulation among pilots practically from the beginning of aviation.
As for the terms Vx and Vy, they do not originate with the CAA/FAA. They stem from aeronautical science going way back, I think it would be hard to find where the first use of the terms was found. Apart from the letters "Vx" and "Vy", the ideas they denote were in circulation among pilots practically from the beginning of aviation.
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