Hello all,

I'm not sure if this scenario would ever arise in the CFPA exam (or perhaps the question will clearly spell it out) - but I wanted to clarify it just in case. It seems like something I should know by now but I don't!

The Part 91 MOS table 19.02 states that for piston/turboprop aircraft with MTOW>5700kg, and for all turbojet aircraft, you require contingency fuel - being 5% of trip fuel.

Meanwhile, Part 135 MOS states that while operating under 135 you require 10% contingency fuel for piston aircraft, and 5% for turbine (I assume that covers turbojet aircraft and turboprops).

Are these requirements cumulative?

In that case, when operating under 135:
Piston, less than 5700kg - nil + 10%
Piston, more than 5700kg - 5% + 10%
Turboprop, less than 5700kg - nil + 5%
Turboprop, more than 5700kg - 5% + 5%
Turbojet, any weight - 5% + 5%

I must remember also that 5 minutes is the minimum for the Part 135 contingency fuel! I wonder if that rule ever comes into play in CFPA?

Am I overthinking this? I'm thinking CFPA focuses on aircraft with MTOW<5700kg so you can essentially forget about the 5% requirement from Part 91. However my understanding is Part 135 can cover MTOWs all the way up to 8618kg, and CASA does identify fuel policy as a weak point for candidates.

(I'm aware that <5700kg is actually up to and including 5700kg)

I have consulted with a former ground theory teacher who told me the exam is exclusively piston aircraft with MTOW <5700kg. In other words, the contingency fuel can always be assumed to be 10%. The only exception is where it states a "company policy" of carrying x% contingency for private flights etc.