ASK-21 POH Info Flashcards
Aircraft structure composition
fiberglass sandwich structure
Wingspan
17m
Aspect ratio
16:1
Max Gross Weight
1322 lbs
VNE (never exceed)
151 kts
VB (rough air)
108 kts
VA (maneuvering)
97 kts
VS1 (airbrakes extended)
37 kts
Do not confuse VS0 and VS1 with powerplane markings.
The ASK-21 POH uses VS0 and VS1 to delineate two stall speeds, airbrakes retracted (0) and airbrakes extended (1).
VS0 (airbrakes retracted)
35 kts
Do not confuse VS0 and VS1 with powerplane markings.
The ASK-21 POH uses VS0 and VS1 to delineate two stall speeds, airbrakes retracted (0) and airbrakes extended (1).
Min Sink
37 kts (solo) - 41 kts (dual)
Best L/D
51 kts
Best L/D glide ratio
33.5 : 1
Max LF (airbrakes retracted) @ VNE
+ 5.3 - 3.0
Max LF (airbrakes retracted) @ VA
+ 6.5 - 4.0
Max altitude before VNE decreases
5,000’
VNE @ 10,000’
144 kts
VNE @ 15,000’
132 kts
VNE @ 20,000’
121 kts
Reason for change in VNE
based upon TAS (true airspeed) to protect against flutter
ASI markings (airspeed indicator)
green 43 - 97 kts
yellow 97 - 151 kts
red 151 kts
yellow triangle 49 kts
Yellow triangle on ASI means
approach speed 49 kts
based upon VS x 1.3
37 x 1.3 = 48.1 (round up = 49 kts)
FAA recommended approach speed
56 kts
based upon FAA VS x 1.5
37 x 1.5 = 55.5 (round up = 56)
Front seat min weight
154 lbs
Front seat max weight
242 lts
1 lead ballast disc is what weight
ballast disc is 1 kg, 2.2 lbs, however position equates to 2.76 lbs
Spin altitude loss
from beginning of recovery until normal flight attitude 260’
Bailing out sequence
if circumstances allow, the front pilot should allow the rear pilot to bail out first
Flight through precipitation (wet or slightly iced wings)
- no deterioration in flight characteristics
- considerable deterioration in flight performance
- add safety margin of 5 kts for approach speed
Tire pressures
- Nose wheel - 28 psi
- Main wheel - 38 psi
- Tail wheel - 35 psi
Recommended tow rope length
100 - 200 ft
Max tow speed
97 kts
Most favorable tow speed
50 - 75 kts
Lift off takes place about
40 kts
Spin entry (with spin ballast)
- Step hard on rudder;
- Then fully pull the stick;
- Ailerons stay neutral
Rigging … main pins vs rear pins
Never insert the rear wing attachment pins prior to the main pins.
CG worksheet, front pilot, has two arm values
Small persons use longer value & set backrest at the forward position
Maximum control deflection at VNE
1/3
