Alexander Schleicher ASK 21 Mi Technical specifications

Flight Manual ASK 21 Mi Flight Manual
(2) Oxygen
For reasons of space, due to the incorporation of the power-plant and
the fuselage tank, only one oxygen bottle can be accommodated in the
ASK 21 Mi, in the baggage compartment. The oxygen bottle fixtures are
only supplied as optional extra and are not provided as standard equip-
ment.
After fitting the oxygen bottle the pilot must make sure that it is securely
seated and that the pin at the front mounting fixture is secured.
Note: Fitting of an oxygen system changes the empty
mass (weight) C.G. position!
Warning: Fuel can ignite itself through pure oxygen.
(3) Emergency Location Transmitter
The least vulnerable location in case of accident is the area between the
two drag spar pins at either side of the fuselage.
Therefore, the emergency location transmitter (ELT) should be fitted, in
an appropriate mounting, in the compartment behind the spar tunnel
(e.g. to the left fuselage wall. Control linkage elements and the access
to or ventilation of electric components on the floor must in no case be
impaired.
Depending on the model of the ELT further possible mounting positions
are the fuselage wall above the opening to the wing leading edge bag-
gage compartment, or - in an appropriate mounting - the cross tube at
the rear instrument panel carrier.
Since the center fuselage section contains carbon fibre layers - and car-
bon screens the aerial radiation - the ELT aerial must be fixed in the
canopy area. Yet the aerial must not be fitted direct to the canopy as it
would be separated from the unit in case of a canopy jettisoning
Issue: 01.12.2007 mh / mg / mm
Revision:
7.29

Flight Manual ASK 21 Mi Flight Manual
Fig. 7.8-1 Fuel System
Issue: 01.12.2007 mh / mg / mm
Revision:
7.30
TN 4 / 09.09.09 M. Münch

Maintenance Manual ASK 21 Mi Maintenance Manual
Issue: 01.12..2007 mh / mg / mm
Revision:
2.67
Fig. 2.12-1 Tank System, schematic
Druckschalter Pressure switch
Brandspant Fire proof bulkhead
Tankgeber Fuel indicat or
6001-04 P
6001- 04P
6001-04 P
6001-04 P
Ei n spr i t z ve nt i l Injection valve
Dr u c k r e gl e r Pressur e regulator
Kraftstofffilter Fuel f i l t er
Kraft stoff pumpen Fuel pumps
Drainerventil Drain valve
Brandhahn Fuel- shut- of f- valve
Vo r f i l t er Pre f ilt er
Rum p f t a n k Fusel age t ank
6001- 04P 6001-04P
Kraftstoffentnahme Fuel o u t l et
Draineranschluss Drain outlet
TN 4 / 09.09.09 M. Münch

Maintenance Manual ASK 21 Mi Maintenance Manual
Issue: 01.12.2007 mh / mg / mm
Revision:
7.9
7.3 Periodic Inspections of the Power-Plant
7.3.1 Daily (prior to each flight)
See Flight Manual Section 4.3!
7.3.2 Every 25 hours
The detail numbers [x] refer to the Figs. at the end of Section 2
1. Check coolant level and where applicable fill up. See also Section
2.11.1.6 in this manual.
2. Re-tighten the six mounting bolts at the propeller flange. (And every
time the propeller has been reinstalled this must be done
additionally already one hour after the re-installation). Observe the
torque moments!).
3. Examine the elastic tensioning cords of the engine compartment
doors. Replace if damaged.
4. With the propeller retracted, the drive belt allows access to the
guide pulleys [36]: check the bearing of the pulleys for play and
friction by rotating them (ball bearing damaged?).
5. Remove residuals caused by oil, exhaust gases or fuel from power-
plant and engine compartment wherever access is possible with
the power-plant installed.
6. Remove drainer valve and clean gaskets.
7. lapsed
8. lapsed
9. Examine fuel hoses for condition, leaks and abrasions.
10. Check condition of cables and electric connectors; watch for any
abrasions.
11. Check condition of control cables and engine operation control
levers for stiffness and abrasions.
TN 4 / 09.09.09 M. Münch

Wartungshandbuch ASK 21 Mi Wartungshandbuch
Ausgabe: 01.12.2007 mh / mg / mm
Änderung:
7.10
12.If required, adjust idling speed (see Section 2.11.1.9).
13. Check secure seating of engine mounting bolts and re-tighten if
necessary (observe torque moments stated in Section 10.6!) Check
locking wires securing the bolts at the front and the rear power-
plant suspension mounting.
14. Check the gas strut of the extending mechanism. If extending takes
significantly more time than retracting, replace the gas strut. This
must be tested with a sufficiently charged engine battery.
15. Examine the rubber elements of the power-plant suspension
mounting for cracks and other changes.
16. Check the engine compartment door hinges for secure seating and
cracks.
17. Check propeller stop block for correct functioning; replace if
necessary.
18. Check the four lateral set screws [33] at the propeller head and
retighten.
19. Check the secure seat of the lock nuts for the three tighteners at
the underside of the propeller head.
20. Check the propeller shaft for radial play in the bearing seat (by
applying radial load onto the shaft).

Maintenance Manual ASK 21 Mi Maintenance Manual
Issue: 01.12.2007 mh / mg / mm
Revision:
7.11
7.3.3 Every 50 hours
1. Inspect the engine in accordance with the Engine Manual.
2. Check drive belt for wear of cogs and wear of the belt sides.
3. Check belt pulleys for wear of teeth and condition of the hard
coating of the aluminum pulleys. Minor wear is permissible.
4. Inspect the belt pulley bearings for play in the ball bearings.
5. Do an engine ground run and watch the exhaust noise emission.
7.3.4 After 150 hours
1. Inspect the engine in accordance with the Engine Manual.
2. Dismount the exhaust silencer and remove the fairing. Inspect the
silencer visually for damages. Inspect the condition of the heat
insulation in the fairing and replace it, if applicable.
3. Replace fuel pre-filter between fuselage tank and fuel shut-off valve
(only original parts of the manufacturer Alexander Schleicher may
be used! Note flow direction).
4. Replace the black fuel main filter behind the fuel pumps (spare part
Mitsubishi MB 957 348).
5. Check the elastic rubber coupling between crankshaft and lower
drive pulley for cracks and replace where necessary.
TN 4 / 09.09.09 M. Münch

Wartungshandbuch ASK 21 Mi Wartungshandbuch
Ausgabe: 01.12.2007 mh / mg / mm
Änderung:
7.12
7.3.5 After one year
1. Inspect the engine in accordance with the Engine Manual.
2. Check coolant level and its required anti-freeze contents.
3. Remove residuals caused by oil, exhaust gases or fuel from power-
plant and engine compartment wherever access is possible with
the power-plant installed.
4. Check the fuel level indicator hose at the fuselage tank every year
for leaks and for condition.
7.3.6 After 3 Years
1. Inspection and maintenance work on the engine in accordance with
the engine manual.
7.4 Special inspection procedures of the power plant
7.4.1 After 1 hour, and 1 hour after each re-installation of the
propeller
1. Check the six mounting bolts of the propeller and re-tighten
(observe torque moments stated in Section 10.6!).

POWER-PLANT MAINTENANCE INTERVALS Maintenance Manual ASK 21 Mi Maintenance Manual
Engine Hours Period Years Period
Once-only Maintenance after 1 hour: Retighten M8 bolts at prop.flange 0 - 150 O450 - 600 O 1 - 5 O
150 - 300 O600 - 750 O 5 - 10 O
300 - 450 O750 - 900 O 10 - 15 O
Maintenance Task at different intervals: Hour Intervals Year Intervals
25507510012515012345
Coolant level check OOOOOO
Retighten propeller bolts OOOOOO
Check elastic tensioning cords of engine compartment doors OOOOOO
Check guide pulleys OOOOOO
Clean power-plant (while installed) & engine compartment OOOOOO
Disassemble and clean drainer valve & gaskets OOOOOO
Check fuel hose lines OOOOOO
Check electric wiring OOOOOO
Inspect control cables of throttle and prop. brake OOOOOO
Check & adjust idling speed OOOOOO
Check firm seating of engine mounting bolts OOOOOO
Check gas strut/extending spindle OOOOOO
Inspect rubber suspension buffers of engine mounting for cracks or other changes OOOOOO
Check engine compartment door hinges for firm seat or cracks OOOOOO
Check propeller stop block for function. If required, replace. OOOOOO
Check & retighten the 4 lateral set screws at the propeller head OOOOOO
Check secure seat of the lock nuts for the 3 tighteners OOOOOO
Check propeller shaft for radial play in the bearing seatings OOOOOO
Maintenance work at the engine as per Engine Manual OOO
Check drive belt for wear OOO
Check belt pulleys for wear OOO
Inspect belt pulley bearings for play in the ball bearings OOO
Check exhaust noise emission during engine ground run OOO
Inspect engine as per Engine Manual O
Disassemble and check exhaust silencer and its fairing O
Exchange fuel pre-filter O
Exchange fuel main filter O
Inspect rubber coupling between crank shaft and lower drive pulley for cracks O
Inspect engine as per Engine Manual OOOOO
Check coolant level and its anti-freeze contents OOOOO
Clean power-plant (while installed) & engine compartment OOOOO
Fuel level indicator hose at the fuselage tank: check for leaks and condition OOOOO
Inspect engine as per Engine Manual O
Issue: 01.12.2007 mg /mh / mm
Revision: TN 04 / 09.09.09 M. Münch
7.14
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