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 pin ?
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
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
6
11.2
Operation ranee class8s
6
11.3
Equipllent 7
11.4
Speed.
8
II., Load factors
9
II.6 Weights
9
11.7
In night c.g.
10
11.8
Weight and balance intormation
10
11.9
Tov relN.es
12
11.10
Weak link in tov rope
12
11.11
'rire pressure
12
11.12 Cross wind
12
III. m.ergenc,. procedure.
13
III.1 RecoTery trom spins
13
III.2
Canop,. emergency jettisoning and
.. ergency bailout
13
111.3
Flight. in the rain
14
111.4
Wine dropping
15
111.5
Ground looping
15
IV. Normal
operation procedures
16
IV.1
Cockpit and operating levers
16
- 20
IV.2 Dail,. checks
21
IV.3
Pre take off check
23
IV.4
'rake ott
24
IV.5 Free flight 25
IV.6
Lov speed tlight and ving dropping
25
IV.7
High speed flight
26
IV.8
Cloud fl,.ing
26
IV.9
Aerobatic.
27 - 3'+
IV.10 Approach and landing
35
v.
Riggi_g and derigging
36
V.1 Rigging
36
April 1<)80
3 3
p,<" 'RnA ~n

ASK 21 -
night Manaal
V.2
Derillinl
37
V.3 Parkins
37
V.4 Road
Transport
37
V.5
Preventive .aintenance
,e
Airspeed position error
Spee. polar
"
ItO
Lubrication scheme
Z.1
April 1980
4
It

MIt 21 - night MaDllal
~
1.3 DESCRIPTION
!he ASK 21 is a tvo-s .. ter sailplane vith T-tail,
fixed nose wheel .. d diTe brakes on upper wing.
'!he .. in landing ,ear i. sprung.
The sailplane i. built in FRP-salldwich-.onocoq,ue
con.tnction. It Ita)' ....... tor .chool nel
hieb pertoraaace tli~t. a. vell as tor aerobatici
ot the Airvorthi .... Category 'A'.
'feellaieal Data
Span
17.00 • ( 55,74 tt)
Len.th
8,35 81 ( 27,38
tt)
Jleipt
1,55 • (
5,08 tt)
Win. area
17,95 •2 (192,95 eq.ft)
Aspect ratio
16,1
Max all-up veicht
600 kg
(1320 lb.)
Max via. loadi ..
33,4kc/M2 (6,84
Iba/sq. it)
April 1980
5 s

ASK 21 - Flight Manual
II. OPERATING LIMITATIONS
11.1 AIRWORTRlKESS CATEGORY
Basis of the type-appro~al are the Airworthines.
lequire.ent. for Sailplane. and Powered Sailplane~
(LrSM) , i.aue Oct. 23. 1975, with the Airworthi-
ness Category 'A' (Acrobatic).
11.2 OPERATION RANGE CLASSES
The operation range classes appro~ed for the par-
ticular sailplane are indicated by a data piacare
on the inatr .. ent panel (see Maintenance Manual
pace ). »ependins on the respective equi~ent
the .. 11p1aoe "7 be lieen.ed for traffic for thE
followiac operation raftSe cla.se. :
1. Airworthiness 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