Rough Engine- Was It Carb Ice Or Vapour Lock?

Rough Engine- Was It Carb Ice Or Vapour Lock?
On a recent flight I experienced a really rough running engine, with a loss of power. It could have been Carb Ice Or Vapour Lock, but we'll never really know. What I do know is that if it was vapour lock (something that early Cessna 172s are susceptible too), you really need to know how to fix the problem before you become another forced landing statistic.
Here is the AD:
72-07-02 CESSNA: Amdt. 39-1415. Applies to the following airplanes:
MODELS SERIAL NUMBERS AFFECTED
172 28000 thru 29999
172 36000 thru 36999
172 46001 thru 46754
172A 46755 thru 47746
172B 17247747 thru 17248734
172C 17248735 thru 17249544
172D 17249545 thru 17250572
172E 17250573 thru 17251822
172F 17251823 thru 17253392
172G 17253393 thru 17254892
172H 17254893 thru 17256512
172I 17256513 thru 17257161
172K 17257162 thru 17258855
Compliance: Required as indicated, unless already accomplished.

To reduce the possibility of engine power interruption at altitudes above 5000 feet caused by vapor formation in the fuel lines, accomplish the following:

(A) Effective now, the airplane must be operated on a single fuel tank immediately upon reaching cruise altitudes above 5000 feet.

(B) On or before April 1, 1972, install at the fuel selector valve applicable Cessna placards P/N's 0509021-1, 0509021-2 or 0509021-3 as provided with Cessna Service Letter SE72-7, dated March 17, 1972, or any FAA-approved equivalent placard which reads as follows: SWITCH TO SINGLE TANK OPERATION IMMEDIATELY UPON REACHING CRUISE ALTITUDES ABOVE 5000 FEET.

(C) Compliance with the provisions of Paragraphs A and B is no longer required when the fuel system has been modified by the installation of applicable Cessna Kit No. SK172-31B or SK172-32 referenced by Cessna Service Letter SE72-7, dated March 17, 1972, or by the accomplishment of any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

This amendment becomes effective March 25, 1972.




This summer (June 2023) I'm flying in a 2,086nm fundraiser for Hope Air, an organisation that helps lower income Canadians or those who live in remote areas access healthcare by providing flights (through private pilots and airlines) to larger urban centres.

If you wish to donate to Hope Air: https://support.hopeair.ca/give-hope-...
To learn more about the Hope Air Charity: https://hopeair.ca/impact-en/


⚠️ NOTE: These videos are edited for time and entertainment. Editing removes context and can remove safety checklists in the interest of time. Do not use these videos for, or in lieu of flight training.⚠️

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