Ch 3 - Allowed Take-Off Mass

Question 1

Allowed T/O Mass (ATOM)

Answer 1

Max mass an aircraft can be at T/O

Taking into account all possible restrictions and limits

Lowest of:

• MZFM + T/O Fuel
• RTOM (regulated T/O Mass)
• RLM + Trip Fuel

Use the Lowest as your limiting factor!!

Question 2

Block Fuel / Ramp Fuel

Answer 2

Fuel on board at the ramp after it has been prepared for flight

Question 3

Start Up and Taxi Fuel

Answer 3

Amount of fuel expected to be used for start up and taxi

Question 4

T/O Fuel

Answer 4

Fuel at the beginning of the take-off roll.
Includes:
- Trip Fuel
- Alternate Fuel
- Reserve Fuel
- Extra Fuel (Captains Discretion) 

T/O Fuel = Block Fuel - Start Up and Taxi Fuel

Question 5

Trip Fuel

Answer 5

Expected (at the planning stage) fuel to be burned between T/O and Landing

Question 6

Reserve Fuel

Answer 6

Includes:

• Contingency Fuel - Met. Conditions
• Alternate Fuel - Overhead -> Alternate Dest.
• Additional Fuel - Specific Requirements?
• Final Reserve Fuel - Restrictions upon the amount

Question 7

Landing Fuel

Answer 7

= T/O Fuel - Trip Fuel -> Touch Down

Question 8

Mass Change During Flight

Answer 8

Ramp Mass

                         Minus Start-up and Taxi Fuel

                                       T/O Mass

        - Trip Fuel                                             - T/O Fuel

= Landing Mass = ZFM

Question 9

RTOM

Answer 9

Regulated T/O Mass

= Lowest of the MSTOM and the PLTOM

Question 10

MRJT Error….

Answer 10

Watch out for the maximum ramp mass (mrm) if you are using the ATOM from the RTOM

• If taxi fuel is over 260kg

Only in MRJT unless they specify a ramp mass for you

MRM - Taxi Fuel = RTOM