ASK-21 POH Info

Question 1

Aircraft structure composition

Answer 1

fiberglass sandwich structure

Question 2

Wingspan

Answer 2

17m

Question 3

Aspect ratio

Answer 3

16:1

Question 4

Max Gross Weight

Answer 4

1322 lbs

Question 5

V_NE (never exceed)

Answer 5

151 kts

Question 6

V_B (rough air)

Answer 6

108 kts

Question 7

V_A (maneuvering)

Answer 7

97 kts

Question 8

V_S1 (airbrakes extended)

Answer 8

37 kts

Do not confuse V_S0 and V_S1 with powerplane markings.
The ASK-21 POH uses V_S0 and V_S1 to delineate two stall speeds, airbrakes retracted (0) and airbrakes extended (1).

Question 9

V_S0 (airbrakes retracted)

Answer 9

35 kts

Do not confuse V_S0 and V_S1 with powerplane markings.
The ASK-21 POH uses V_S0 and V_S1 to delineate two stall speeds, airbrakes retracted (0) and airbrakes extended (1).

Question 10

Min Sink

Answer 10

37 kts (solo) - 41 kts (dual)

Question 11

Best L/D

Answer 11

51 kts

Question 12

Best L/D glide ratio

Answer 12

33.5 : 1

Question 13

Max LF (airbrakes retracted) @ V_NE

Answer 13

+ 5.3 - 3.0

Question 14

Max LF (airbrakes retracted) @ V_A

Answer 14

+ 6.5 - 4.0

Question 15

Max altitude before V_NE decreases

Answer 15

5,000’

Question 16

V_NE @ 10,000’

Answer 16

144 kts

Question 17

V_NE @ 15,000’

Answer 17

132 kts

Question 18

V_NE @ 20,000’

Answer 18

121 kts

Question 19

Reason for change in V_NE

Answer 19

based upon TAS (true airspeed) to protect against flutter

Question 20

ASI markings (airspeed indicator)

Answer 20

green 43 - 97 kts

yellow 97 - 151 kts

red 151 kts

yellow triangle 49 kts

Question 21

Yellow triangle on ASI means

Answer 21

approach speed 49 kts

based upon V_S x 1.3
37 x 1.3 = 48.1 (round up = 49 kts)

Question 22

FAA recommended approach speed

Answer 22

56 kts

based upon FAA V_S x 1.5
37 x 1.5 = 55.5 (round up = 56)

Question 23

Front seat min weight

Answer 23

154 lbs

Question 24

Front seat max weight

Answer 24

242 lts

Question 25

1 lead ballast disc is what weight

Answer 25

ballast disc is 1 kg, 2.2 lbs, however position equates to 2.76 lbs

Question 26

Spin altitude loss

Answer 26

from beginning of recovery until normal flight attitude 260’

Question 27

Bailing out sequence

Answer 27

if circumstances allow, the front pilot should allow the rear pilot to bail out first

Question 28

Flight through precipitation (wet or slightly iced wings)

Answer 28

• no deterioration in flight characteristics
• considerable deterioration in flight performance
• add safety margin of 5 kts for approach speed

Question 29

Tire pressures

Answer 29

• Nose wheel - 28 psi
• Main wheel - 38 psi
• Tail wheel - 35 psi

Question 30

Recommended tow rope length

Answer 30

100 - 200 ft

Question 31

Max tow speed

Answer 31

97 kts

Question 32

Most favorable tow speed

Answer 32

50 - 75 kts

Question 33

Lift off takes place about

Answer 33

40 kts

Question 34

Spin entry (with spin ballast)

Answer 34

• Step hard on rudder;
• Then fully pull the stick;
• Ailerons stay neutral

Question 35

Rigging … main pins vs rear pins

Answer 35

Never insert the rear wing attachment pins prior to the main pins.

Question 36

CG worksheet, front pilot, has two arm values

Answer 36

Small persons use longer value & set backrest at the forward position

Question 37

Maximum control deflection at V_NE

Answer 37

1/3