Ch 2 - Aircraft Mass Definitions

Question 1

BEM

Answer 1

Basic Empty Mass

Compromises:

• Empty clean aircraft
• Any unusable fuel/ liquids (lubrication and hydraulic fluids)
• Safety equipment
• Supplementary electronic equipment

Should remain constant between weighing unless modified or changed

Question 2

The Variable Load

Answer 2

Compromises:

• Crew and their baggage
• Catering and other removable passenger service equipment
• Food and beverages
• Potable (drinking) water
• Lavatory chemicals
• Any other special operational equipment

Question 3

The Traffic Load

Answer 3

Compromises:

• Passengers
• Baggage
• Cargo
• Non-revenue load (load transported to support company)

Question 4

Fuel

Answer 4

Ramp Fuel (block fuel)- Usable fuel includes taxi fuel

T/O Fuel - End of the runway, start of take off (ramp fuel - taxi fuel)

Landing Fuel (T/O fuel - Landing Fuel = Trip Fuel) - can limit T/O mass

Question 5

AUM

Answer 5

All Up Mass (Gross/Total mass)

• Total mass of the aircraft and decreases during flight (fuel burn)

Compromises:

• BEM
• The Variable Load
• The Traffic Load
• The Fuel

Question 6

B,V,T,F

Answer 6

Big - BEM
Vans - The Variable Load
Travel - The Traffic Load
Fast - The Fuel

Question 7

DOM

Answer 7

Dry Operating Mass

Compromises:

• BEM
• The Variable Load

Question 8

Useful Load

Answer 8

Compromises:

• The Traffic Load
• Fuel

Question 9

Operating Mass

Answer 9

Compromises:

• BEM
• The Variable Load
• Fuel

Question 10

ZFM

Answer 10

Zero Fuel Mass

Compromises:

• BEM
• The Variable Load
• The Traffic Load

Question 11

B,V,T,F,D,U in OZ

Answer 11

Big Vans Travel Fast Down Under in OZ

BEM
The Variable Load
The Traffic Load
Fuel

Dry Operating Mass
Useful Load

Operating Mass
Zero Fuel Mass

Question 12

Fuel

Answer 12

Taxi Fuel
\+
T/O Fuel - Trip Fuel = Landing Fuel
=
Block Fuel

Question 13

T/O Fuel

Answer 13

= Block Fuel - Taxi Fuel (which is usually a given amount)

Question 14

Traffic Load

Answer 14

= All Up Mass (AUM) - Operating Mass (OM)

Question 15

Zero Fuel Mass

Answer 15

= Traffic Load + Dry Operating Mass (DOM)

Question 16

MSTOM/MTOM

Answer 16

Maximum Structural Take-Off Mass / Maximum Take-Off Mass

Structural Limitation

Question 17

MLM

Answer 17

Maximum Landing Mass

Structural Limitation

Question 18

MZFM

Answer 18

Max. Zero Fuel Mass

Structural Limitation

Question 19

MSTM

Answer 19

Max. Structural Taxi Mass

Structural Limitation

Question 20

MRM

Answer 20

Maximum Ramp Mass

Structural Limitation

Question 21

PLTOM

Answer 21

Performance Limited Take off Mass

Performance imposed limit

• Field Length
• Climb Limit
• ASDA (Aircraft Stopping Distance …..?)
• Obstacle Limit

Question 22

PLLM

Answer 22

Performance Limited Landing Mass

Question 23

Regulated Mass

Answer 23

Must employ the most limiting of either the performance or structural limitations.

Question 24

RLM

Answer 24

Regulated Landing Mass

Question 25

RTOM

Answer 25

Regulated Take off Mass