Why do we calculate mass and balance?

Why do we calculate mass and balance?

To be within aircraft design limitations with regards to:

Structural limitations

Stability

Take-off and landing performance

What can you tell about adiabatic lapse rates?

What can you tell about adiabatic lapse rates?

When considering a volume of air, adiabatic lapse rate is the temperature change that is caused by the vertical movement of the volume, andThe Lapse Rate is the rate at which temperature changes with height in the atmosphere.

The Environmental Lapse Rate (ELR) is according to ISA 2°C per 1000 feet increasing altitude.

For unsaturated air, the lapse rate is 3°C per 1000 feet, this is called the Dry Adiabatic Lapse Rate (DALR).

The Saturated Adiabatic Lapse Rate (SALR) is the rate at which saturated air cools with height and is, at low levels and latitudes, 1.8°C per 1000 feet.

Why do we measure speed as a Mach number?

Why do we measure speed as a Mach number?

Mach number describes the speed of sound, which changes with the density of the medium it is travelling through.

When you reach the speed of sound, the compressibility effect creates a supersonic flow along the wing if you exceed a certain mach number.

This causes airflow separation and flutter.

It is therefore much safer and much easier to use a Mach number to express a limit at which compressibility effects start to tear the aircraft apart, as it is a constant value at all altitudes.

Explain the Fohn wind.

Explain the Fohn wind.

A Fohn wind is a warm dry wind that blows down the lee side of a mountain.

Initially, the air temperature cools dry-adiabatically (3°C/1000 ft), until its dew point temperature is reached. Condensation occurs as the air is further forced up the mountain range, resulting in the air cooling saturated-adiabatically (generally considered in the mid-latitudes to be 1.8°C/1000 ft). Clouds and precipitation form. When the air mass reaches the top of the mountain range it has lost a significant amount of its water content and so has a much lower dew point temperature.

As the air then begins to descend down the lee slope of the mountain the compressed air is initially heated saturated-adiabatically, and in effect the direct reverse to the cooling effect on the windward side occurs. As the air continues leeward and downward from the mountain range, the air, now no longer saturated, is heated dry-adiabatically.

The resultant wind is dry and warm giving clear conditions at airfields on the lee side of the mountain range.

The Foehn Effect also may be associated with mountain wave activity.

What do high lift devices do?

What do high lift devices do?

High lift devices increase the lift produced by a wing, allowing the aircraft to operate at lower speed ranges usually for take off and landing.

Describe the take off segments.

Describe the take off segments.

1st segment starts at screen height and finishes at gear retracted.

2nd segment starts when the gear is retracted and finishes when acceleration alt is reached (min. 400ft max 1000ft) speed V2.

3rd segment starts at acceleration alt, minimum 400ft, and finishes when the flaps are retracted.

4th segment starts when the flaps are retracted, MCT is set and finishes at the 1500ft.

What is the typical range of an NDB?

What is the typical range of an NDB?

Average range over land 20 - 25 miles.

Range for an NDB can be calculated with:

2√power output in Watts = Range (Land) 3√ power output in Watts = Range (Water)

What is the average temperature at 25,000ft according to ISA?

What is the average temperature at 25,000ft according to ISA?

-35°C

What would you do in the event of an engine failure below V1, and what would your initial actions be?

What would you do in the event of an engine failure below V1, and what would your initial actions be?

Assuming I'm performing single pilot operations:

  • power idle,

  • max brakes (and reversers if available),

-maintain directional control using rudder input,

  • After coming to a full stop set parking break.

  • Inform ATC 'Stopping'.

  • Initiate the appropriate process to diagnose the problem (ECAM, NITS DODAR, checklists....).

  • When performing multi pilot operations the actions performed by me will depend with my current role: PF, PM and/or CM1 CM2.

How do you prevent an aircraft reaching Mcrit?

How do you prevent an aircraft reaching Mcrit?

Decreasing speed, by reducing engine power or pitching up.

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