Alexander schleicher Ask 21 Technical specifications

ASK

21

Flight

Manual

Maintenance

Manual

Repair

Manual

ALEXANDER

SCHLJ:ICHD

SIGILFLUGZEUGBAU

6416

Poppenh.u

••

n/

W

••••

rkupp.,

W.st

G.raany

F L I G H T

MAN

U A L

for

th.

sailpl.n

••

od.l

ASK

2 1

•••

m=_.===:

This

m.nual

.ust

.lw.ys

b.

c.rri.d

on

bo.rd

!

It

b.lonls

to

the

sailpl.ne

ASK

21

V.ri.nt

Data

Sh

••

t

no.339

............

Seri.l

no.:

· .

R.listration

no.:

· .

Owner : · .

· .

Manuf.cturer

:

Alex.nder

Schleich.r

Se.elflugz.ugbau

6416

Popp.nh.usen/

Wasserkupp

West

Ger

••

ny

Thi

•••

mu.l

is

the

transl.tion

of

the

German

ori-

ginal

which

is

.pprov.d

by

the

LBA

(Federal

OfficE

of

Civil

Aeron.utics

of

the

F.d.R.p.

of

Ger.any)

a.

oper.ting

instructions

accor.ing

to

para

12

C1}

2

of

the

German

'LuftG.rPO'

(Aviation

Equip-

ment

Test

-.cul.tions).

Th.

tr.nal.tion

h.s

b.en

don.

by

be.t

knowled,e

and

judl

•••

nt.

In

.ny

ca

••

the

orilinal

text

in

G.rman

l.nlu.ge

is

.uthoritative.

APRIL

1980

EditioD

1

ASK

2 1

FLIGHT

MANUAL

Check

List

I 1

z

•••

z:::==========

Pre

Fliaht

Check

1.

Main

pins

safetied

?

2. Rear wing attachment

pins:

is

the

safety

lock

visible

above

the

?

3.

Horizontal

tail

unit

pins

safetied

?

Is

the

spring

retainer

engaged ?

4.

Elevator

pushrod

connected?

Safetied

with a

spring

clip?

This

is

not

applicable

for

gliders

which use

the

automatic

elevator

connection

!

5.

Aileron

pushrods

connected?

Safetied

with a

spring

clip?

Do

not

forget

the

sight

control

through

the

access

hole

cover !

6. Airbrake pushrods connected ?

Safetied

with

a

spring

clip

?

Do

not

forget

the

sight

control

through

the

access

hole

cover !

7. Check

for

foreign

bodies

!

Attention!

With

all

BOTELLIER

quick-release

joints

one must be

able

to

touch

the

ball

pivot

by

feeling

through

the

slot

in

the

ball

socket.

Check

the

proper

engage-

ment of

the

safety

lock

by pushing

it

on

to

close

!

I

'IN-No.20

dated

16.10.87

C H E C K

LIST

/2

Pre

take

off

check

1.

Parachute

connected

to

harne.s

?

2.

Safety

harness

fa.tened

?

3.

Airbrake.

locked

?

4. Trim

lever

adjusted

to

a

middle

po.ition

?

5.

Altimeter

adjusted

?

6.

Canopies

closed

and

locked

?

Rear

canopy

I I

7.

For

flight

with

only

one

occupant

r

..

ove

rear

back

rest

II

8.

Put

your

toes

under

the

toe-straps

I!

Do

not

flatten

the

straps

II

Danger

of

ja

..

ing

the

pedals

II

April

1980

ASK21 Flight

Manual

1.1

Amendments

record

Rev. Title

No.

1 weak link in towrope,

TN-No.6

2 weak link in towrope,

TN-No.8

3 Automatic elevator Connection,

TN-No. 11

4 Modification of the Flight Manual,

TN-No. 13

5 Amendment of the Flight Manual,

TN-No. 13 a

6 New canopy locking system,

TN-No. 15

7 Change / supplement to the Flight

Manual, TN-No. 20

8 New production series tow release

couplings for aerotow and winch

launch, TN-No. 21

9 Checking and exchange of the parallel

rocker at the elevator actuator rod,

TN-No. 22

10 Revision of the Flight Manual,

TN-No. 23

11 Rudder actuated by means of hand

lever TN-No. 25 (optional)

12 AD 93-001/213, L'Hotellier instructions

for the maintenance, Rev. E 03/94

13 Extension of service life beyond 12000

operation hours, TI\! No. 29

Page Date

Sianatura

12

15.04.~

12

16.05.8P

36 a, 36 b,

20.11~

Checklist /1

10 b

23.02~

10 c

04.06~

10 b deleted

16 a, 17 a,

08.0~

18a&

19a

Checklist /1, 21,

03.11~

36 a, 36 b & 37

Annex

17.08~

36 b, 37 a, 37 b 26.11,E.

p

13,15,25,26

15.0~

16a & 21

17.0~

Annex

27.0~

43f 04.05.06

mm

Author Date

Rev.no. I Date Sig. Page no.

Kaiser April 80 2

LBA-anerk.

ASK21

Flight

Manual

Amendments record

Rev. Title Page Date

Siqnature

No.

Author Date

Rev.no. I Date Sig. Page no.

Kaiser April 80

2a

ASK

21 -

Flight

Manual

1.2

COJrl'D1'S

Page

I.

General

1

1.1

Aaen~ent.

record

2

1.2

Content.

3+4

1.3

De.cription

5

II.

Operating

limitation.

6

11.1

Airworthines.

Category

'u'

(UTILITY)

a.

According

to

VFR

(during

daylight)

-

with

equip.ent

a.

per

II.}

a.

b.

Cloud

nipt.

-

with

equipllent

a.

per

II.}

a

and

II.}

c.

2.

Airworthine

••

Categor,.

'A'

(Acrobatic)

-

with

equipment

as

per

II.}

a

and

11.3

b

or

11.3

a,

11.3

b

and

II.,

c -

tor

tbe

foll.wia,

a.rob.'io.

I

Loop,

Stall

Turn,

Split'S',

I

••

elmann,

Slow

Roll,

Inverted

Flights,

Spin,

Steep

ClimbingTurn,

Lazy

Eight,

Chandelle.

April

1980

6 6

ASK

21 -

Flisht

Manual

II.,

IQU

I

PMXNT

a.

Min.

equipment

1.

Airapeed

indicator

up

to

}CO

ta/b

2.

Alti.eter

,.

Four-piece

aarety

harneas

tor

front

and

r

..

r

•••

t

4.

Seat

cYabiona,

at

l

...

t 10cm

thick

when

loaded,

or

parachYt

••

(aatoaatic

or

manual)

5. Weiaht

and

balance

data

placard

(front

and

rear

aeat)

6.

Data

plate

7.

Flicht

Manual

b.

Iquipaent

for

aerobatica

For

a.robatica

tbe

abo.e

min.

e~uipaeDt

muat

be

.uppl

••

ented

aa

followa

:

1.

Additional

bottom

atrap

for

t.e

aafety

harne

••

2.

G-meter

for

front

seat

,.

Foot

loops

on

rudder

pedal.

4.

Parachute

(auta.atic

or

...

ual)

c.

!gulp!e.~

for

cloud

flying

For

cloud

flying

the

above

min.

equip.ent

must be

.uppl

..

ented

as

tollowa

:

1.

VariOileter

2.

~r.

and

bank

indicator

,

.......

tic

coapa_

(coapen_te.)

4.

YRF

transcei.er

radio

7

April

1980

ASIC

21 -

nipt

Manual

II.4

SPUDS

Max

speed

calm

air

V.

.·)280

lca/h

(151

kts)

Max

speed

rough

air

VB

•

200

lnl/h (108

kts)

Max aaneUVeriD&

speed

V

M • 180 kII/h ( 97

kts)

Max

speed

aerotov

V

T • 180

kll/h

( 97

kts)

Max

speed

winch tow

V'fI

• 150

ka/h

( 81

kts)

Rough

air

aeans

turbulence

found

in

'lave-rotors,

Cn-clouds,

dust

devils

or

when -skimming

1I0untain

cre.te.

Maneuvering

speed

V,

is

the

highest

spee.

at

which

full

control

deflee

ions

atill

.~

be

applie

••

'fIi

th

.ax

speed

V

RE

onl,.

one

third

ot

the

...

pos-

aible

deflection.

aa,.

be

.p,lie4.

eae

..

-'

alao

take

into

account

that

with

increa.inc

altitude

the

true

airspeed

is

higher

than

the

r""Q.

ot

the

A.S.I.

beeau

••

of

the

decrea.iDI

air

~t,..

True

airspeed

(TAS)

is.

hove.er.

relevant

tor

sate-

t,.

against

nutter.

.)

The max

indicated

V

KE

ia

reduced

a.

follows

ac-

cording

to

altitude

J

A1

ti

tude

(Ill)

V.I

indicated

(km!h)

0-2000

3000 4000 5000 6000

280 267

2'5

239 226

Altitude

(tt)

10000

15000

20000

5000

121

V

o

indicat.d

(kt.)

1'+'+

132

151

April

1.

g

8

,,....

The

airspeed

indicator

lIust

lIhow

the

following

color

codes

:

Gr

..

n

arc

80-180

kIl/b

(4,..

97

kts)

Yellow

arc

180-280

laa/Ia

(97-151

kt.)

Reel

radial

line

at

280

kll/h

(at

151

kt.)

Y.llow

triangle

at

90

ka/'A

(at

"8,5

let.)

11.5

LOAD

FACTORS

The

following

load

factors

must

not

b.

exceeded

.

at

_.euvering

speed

VM

+6,5

-",0

at

-ax

speed

Vo

+5,3

-3,0

with

airbrake.

extended

+3,5

+ 0

-

G-

..

ter

_rlci

..

s :

a.

poai

t i

ve

range

,.ellow

arc

red

radial

liae

b.

negative

raa.e

,.ellow

arc

red

radial

line

+5,3

to

+6"

at

+&"

-3,0

to

-'+,0

at

-4,0

I

I.

6

WEIGHTS

IIapt,.

weight

Max

all-up

weisht

Max

weight

of

Don

producing

members

approx.

360kl

600q

lift

410kg

(

792

lb.)

(1320

lb.)

( 904

lb.)

9

April

1980 9

ASK

21 -

Flight

Manual

11.7

IN

FLIGHT

C.G.

!he

in

flight

e.l.

range

is

from

234mm

to

q69am

behind

datum

(9,21't

to

18~46ft);

correspondingl1

20,2

~

up

to

41,1

~

of

the

mean

aerod,na.ic

chord,

t •

1,121.

<:,'68")

",ith

a.

8mm

(0,32")

behind

",fng

leading

edge;

inner

",ing

• datum

point.

Min

payload

front

.eat

Max

payload

front

aeat

Max

pa110ad

rear

seat

Baggage

in

"'ingroots

max

11.8

WEIGHT

AND

BALANCE

INFORMATION

70kg

(154

lb.)

110kg

(242

lba)

110kg

(242

Iba)

2 x

10kg

(2

x 22

lb.)

Neither

the

all

up

",eilht

of

600kl

(1320

lb.)

Dor

the

Ilax

",eight

of

non-lift

producing

.embers

+

occupants

&

baggage

of

410ka

(904

lba)

must

be

exceeded.

The

",eight

liaitationa

On

the

basis

of

the

last

weighiD'

are

to

be

found

on

pale

11 1

With

this

loadinl

the

in

flight

e.g.

is

in

the

permissible

ranee.

Low

weigbt

in

the

front

seat

must

be

compen

••

ted

by

fixed

ballast.

10

APRIL

1980

1fJ

242

lbs

= 110

kg.

1 kg = 2,2046223

lbs

10

c

June

1984

TN

no.

13

a 10c

ASK

21

-

Flight

Manual

II.

WEIGHT

&

BALANCE

INFORMATION

Max.

payload

front

seat

(pilot

incI.

parachute)

: 242

lbs

= 110 kg

Min.

payload

front

seat

(pilot

incI.

parachute)

: 154

lbs

= 70 kg

Caution:

Short

Weight

in

the

front

seat

must

be

co.pensated

by

ballast

(installation

of

lead

discs

in

the

nose;

1

lead

disc

=

2,76

lbs

pilot

weight).

Number

of

lead

discs

0

1

2

3

4

5

6

7

8

9

10

11

12

Max.

payload

rear

Min.

payload

front

seat

kIP:

lbs

70,0

154,32

68.75

151,57

67,5

148,81

66.25

146.06

65,0

143,30

63.75

140.54

62,5

137,79

61.25

135,03

60,0

132.28

58.75

129.52

57,5

126,77

56.25

124.01

55.0

121,25

seat

(pilot

incl.

parachute):

~

Date

of

lapi1

weight

c

•••

Froet

weight'

<_/ia.

behind

balance

datua)

I

~

"d

'1

~

....

I

...

f I

i

;

~

I

aeat

k&!lb.

pa1load

incl.

chute

.i.

,lIax

! 1

I

,

!

(

I

I,

I !

I

I I

, I

!

, I

i! I

I

i

f

t I

l

,i

(

~

I

,

Rear

aeai

ka!lb.

payload

inol.chute

lIin

II

ax

,

I

I I

, I

~

....

I

~

".

\ •

:II:

I

tI

a

•

....

Signature

of

inspeotor,

i.ape.iioll

..

,

...

&

N

...

j

))

I

-4

\

..

ASIC

21 -

nipt

Maaaal

11.9

TOW

REI,KASJ:S

For

a.rotow

:

DOS.

r.l.as.

E 15

For

winch

tow :

saf.ty

r.l

....

Europa

G 13

11.10

VBAIC

LI.

IN

row

ROPE

A.rotow

max. 600 ! 60 daR

Winch tow

_x.

1000

~

100

daN

11.11

!IRE

PRESSURE

Main

wh

••

l

5.00-5:

2,1

bar

Hos.

wh

••

l

".00-4:

2,0

bar

Tail wheel

210x65

2,5

bar

11.12

CROSSWIND

'l'h.

p.rmissible

crosswind

coapon.nt

i.

about

15

kIl/1:l

(8

knots>.

12

June

1983

T.

N.

No

8

ASK

21

Flight

Manual

III.

llttERGENCY

mx:m.JRFS

IlL

1

REXXM:RY

FJDI

SPIN

According

to the standard procedure spinning

is

terminated as

follows:

1.

Apply

opposite rudder

(i

.e.

apply rudder against the direction of

rotation of the spin).

2. Short pause (hold control inputs for about 1/2 spin turn).

Warning:

Disregarding the pause

will

result

in slower recovery!

3. Release

stick

(i

.e.

give in to the pressure of the stick> unti.l

the rotation stops and

sound

airflow

is

established again.

Warning:

Full forward

stick

may

retard or even prevent the recovery!

4.

centralise

rudder and allow sailplane to dive out.

The

altitude

loss fran the beginning of the recovery until the

normal

flight

attitude

is

regained

is

about 80 meter

(260

feet).

Note:

During

spins the

ASK

21

oscillates

in pitch. Fran a steep nose

down

spin recovery according to the standard procedure

is

up

to 1 turn, fran a

flat

spin

less

than 1 turn.

III.2

CAmPY

JEITIOCMNG

AND

llttERGENCY

BAIL

em

Front

canopy:

a.

Move

lever with red

knob

above

the instrument pan-

el

to the

lef

t and push

canopy

upwards.

b.

Open

safety harness.

c. Get up and

bail

out.

d.

With

manual

chute seize release

grip

and

pullout

entirely

after

1 to 3 seconds.

Rev.oo./Date

8ig.

Author

Date

Page

no.

TN23

Jao.91

Waibel

Kaiser

April

90

L

BA-

13

App.

.SK

21 -

nipt

Maaual

Rear

c.nopy

••

Pull

Mek

'both

c.nop7

.id.

lock.

.nd

pu8b

oa80P7

upw.rd

••

b.

Op.n

.af.ty

h.rn

••••

c.

G.t

up

.nd

'b.il

out.

d.

With

...

ual

chute

seiz.

r.l

....

srip

••

4

,.11

out

.ntir.ly

.ft.r

1-'

..

co

••••

If

circum.t.nc

••

allow,

the

front

pilot

Should

al-

low

the

r

••

r

pilot

to

b.il

out

first.

III.3

FLIGHTS

IM

THE

RAIN

With

w.t

or

alilht17

ic.d

willi.

or

in

••

ct

.ccumu-

l.tion

th.r.

will

b.

no

d.t.rior.tion

in

tlight

ch.r.ct.~t1cs.

How.v.r,

on.

h

••

to

r.ckon

with.

rath.r

con.1d.r-

able

d.t.rior.tion

in

flight

pertormance.

TIli.

mu.t

b.

t.k

••

into

.ccount

••

,.c1al11

on l

••

dine

tiDal

.pproach

! t

Add.

,.f,t:

_.rKin

ot

10

k_/h

<',4

knots)

tor

.pproach

sp.ed

11

April

1980

14

ASK

21

Flight

Manual

III.4

WING

DROPPING

'!be sailplane

stalls

extreaely benign. Nevertheless one

always

has

to face the

possibility

of

wing

dropping because of turbulence. In

that

case push

stick

forward :iImaliately and apply opposite rudder

against a noticeable turn

at

the

same

tine

to regain a

normal

flight

attitude.

If

the rudder deflection against the turn

is

forgotten, a

spin

may

occur even

if

the

stick

pressure

is

released.

III.5

GROOND

lOOPING

For

normal

conditions, snroth

runway,

short grass, one

may

take off

with the

wing

on the

ground

without having to fear a

change

in the

direction.

High

grass and

rough

ground,

however,

may

cause

ground

looping. In

that

case release the

tow

rope :iImaliately.

Page

no.

Author

Date

Rev.no./Date

Sig.

Kaiser

April

80

LBA-

15

TN23

Jan.91

Waibel

App.

Alexander Schleicher ASK 21 Technical specifications

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