Aircraft Spin Characteristics

Question 1

What must occur for the aircraft to go into a spin?

Answer 1

• Aircraft must be stalled.

- Can be unbalanced.

Question 2

What is the region of reverse command?

Answer 2

Point where if one wing drops and the pilot tries to correct by putting in opposite aileron, this will exacerbate the stall as the downgoing wing to stall.

Question 3

What is the incipient phase of the spin?

Answer 3

A/C is in autorotation.

Question 4

Which wing is more stalled, the downgoing wing or upgoing wing?

Answer 4

Downgoing wing.

Question 5

What are some characteristics of spin?

Answer 5

• RoD is high and consistent
• Aircraft is rolling, yawing and pitching
• Heavy buffet as A/C is stalled
• Airspeed is low and possibly fluctuating.

Question 6

What should be done with the throttle when entering a spin?

Answer 6

Throttle should be retarded.

Question 7

How many turns of a spin before it goes from incipient to fully developed?

Answer 7

3 turns.

Question 8

What is different about the recovery time from an incipient spin versus a fully developed?

Answer 8

Recovery time is almost immediate in an incipient spin

Question 9

What are some signs to the pilot that the A/C is in the incipient stage?

Answer 9

• Large attitude changes

- Variable rates of yaw and roll.

Question 10

What are the recovery actions in the incipient stage?

Answer 10

1) Set power to idle
2) Centralising controls
3) Once aircraft roll has stoppedk roll wings level to the nearest horizon
4) Nose pitched to the nearest horizon
5) Power smoothly increasing to a cruise setting.

Question 11

What are the three typical phases of the spin?

Answer 11

1) Incipient spin phase
2) Fully developed spin phase
3) Spin recovery phase

Question 12

For a left spin, what way will the turn indicator and balance ball indicate?

Answer 12

1) Turn indicator fully out to the left

2) Balance ball fully out to the right.

Question 13

For a right spin, what way will the turn indicator and balance ball indicate?

Answer 13

1) Turn indicator fully out to the right

2) Balance ball fully out to the left.

Question 14

What are the two factors present in a spin?

Answer 14

1) Aerodynamic moments (such as A/C design stability)

2) Moments of inertia

Question 15

Are aerodynamic moments and/or moments of interia pro spin or anti spin?

Answer 15

Aerodynamic moments are anti-spin

MOments of inertia are pro spin

Question 16

What is the B gyro refer to?

Answer 16

Pitch rotation

Question 17

What does A gyro refer to?

Answer 17

Aileron rotation

Question 18

What does the C gyro refer to?

Answer 18

Yaw rotation

Question 19

Is a large B/A ratio pro or anti spin?

Answer 19

Anti

Question 20

Is a small B/A ratio pro or anti spin?

Answer 20

Pro

Question 21

Will aircraft with a heavy fuselage and a light wing structure have a large B/A ratio?

Answer 21

Yes

Question 22

Is a large B/C ratio pro or anti spin?

Answer 22

Anti

Question 23

Is static lateral roll stability pro or anti spin?

Answer 23

Pro

Question 24

Is normal axis yaw stability pro or anti spin?

Answer 24

Anti

Question 25

Is static longitudinal stability pro or anti spin?

Answer 25

Anti

Question 26

What is control surface blanking?

Answer 26

Disturbed flow caused by flow hitting tailplane on the side, which reduces the control effectiveness or the rudder and results in control blanking.

Question 27

What are the recovery actions for a fully developed spin?

Answer 27

1) Throttle to Idle
2) Ailerons to neutral
3) Full opposite rudder
4) Centralize the control column (or slightly forward) t to reduce buffet

Question 28

What is the wind up effect associated with spin recovery in a full developed spin?

Answer 28

• The upper outer wing developing more lift as the AC installs, due to its higher relative rotational speed
• an inertial moment , by moving the control column forward, nose down pitch applies a pitching force to the C gyro yaw moment, which processes through 90 degrees resulting in a. Spin roll.