Stall

Question 1

Stalling involves loss of ___ and loss of ___

Answer 1

Stalling involves loss of HEIGHT and loss of CONTROL.

Question 2

A pilot must be able to clearly and unmistakably ___ a stall.

Answer 2

A pilot must be able to clearly and unmistakably identify a stall

Question 3

A stall is caused by airflow ___

Answer 3

A stall is caused by airflow separation

Question 4

Separation can occur when either the boundary layer has insufficient ___ energy or the
____ gradient becomes too great.

Answer 4

Separation can occur when either the boundary layer has insufficient KINETIC energy or the
ADVERSE PRESSURE gradient becomes too great.

Question 5

Adverse pressure gradient increases with increase in ________

Answer 5

Adverse pressure gradient increases with increase in ANGLE OF ATTACK

Question 6

Alternative names for the angle of attack at which stall occurs are the ___ angle and the
___ angle of attack

Answer 6

Alternative names for the angle of attack at which stall occurs are the STALL angle and the
CRITICAL angle of attack

Question 7

The coefficient of lift at which a stall occurs is ___

Answer 7

The coefficient of lift at which a stall occurs is C_LMAX.

Question 8

A stall can occur at any ___ or flight ____

Answer 8

A stall can occur at any airspeed or flight attitude

Question 9

A typical stalling angle is approximately ___°.

Answer 9

A typical stalling angle is approximately 16°

Question 10

To recover from a stall the angle of ____ must be ____.

Answer 10

To recover from a stall the angle of ATTACK must be DECREASED.

Question 11

Maximum power is applied during stall recovery to minimize ______

Answer 11

Maximum power is applied during stall recovery to minimize HEIGHT loss.

Question 12

On small aircraft, the ____ should be used to prevent wing ____ at the stall

Answer 12

On small aircraft, the RUDDER should be used to prevent wing DROP at the stall

Question 13

On swept wing aircraft the ___ should be used to prevent wing ___ at the stall.

Answer 13

On swept wing aircraft the AILERONS should be used to prevent wing DROP at the stall.

Question 14

Recover height lost during stall recovery with moderate ___ pressure on the ___ control.

Answer 14

Recover height lost during stall recovery with moderate BACK pressure on the ELEVATOR control.

Question 15

The first indications of a stall may be ___ flight controls, ____ device or
aerodynamic ____.

Answer 15

The first indications of a stall may be UNRESPONSIVE flight controls, stall WARNING device or
aerodynamic BUFFET.

Question 15

At speeds close to the stall, ___ must be used with caution to ___ a dropping wing.

Answer 15

At speeds close to the stall, AILERONS must be used with caution to LIFT a dropping wing.

Question 16

Acceptable indications of a stall are:

Answer 16

(1) a nose-down pitch that can not be readily arrested.
(2) severe buffeting.
(3) pitch control reaching aft stop and no further increase in pitch attitude occurs

Question 17

Reference stall speed (VSR ) is a CAS defined by the ____

Answer 17

Reference stall speed (VSR ) is a CAS defined by the AIRCRAFT MANUFACTURER.

Question 17

An artificial stall warning device can be activated by a ____ switch, an ____ vane
or an ______.

Answer 17

An artificial stall warning device can be activated by a flapper switch, an angle of attack vane
or an angle of attack probe.

Question 18

A rectangular wing planform will tend to stall at the ___ first.

Answer 18

A rectangular wing planform will tend to stall at the ROOT first.

Question 19

An aerofoil section with camber near the _____ will stall at a higher angle of attack.

Answer 19

An aerofoil section with camber near the LEADING EDGE will stall at a higher angle of attack.

Question 20

An aerofoil section with a large thickness-chord ratio will stall at a ___ angle of attack and
will stall more ____.

Answer 20

An aerofoil section with a large thickness-chord ratio will stall at a HIGHER angle of attack and
will stall more GENTLY.