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SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T WARTUNGSHANDBUCH / MAINTENANCE MANUAL

0.2 Verzeichnis der Seiten / List of effective pages

Seite / Page Datum / Date Bezug / Reference 

0.1.1 

0.2.1 

0.2.2 

0.2.3 

0.3.1 

0.3.2 

0.3.3 

1.1 

1.2.1 

1.2.2 

1.2.3 

1.3 

1.4 

2.1.1 

2.1.2 

2.2.1 

2.2.2 

2.3 

2.4 

3.1.1 

3.1.2 

3.2.1 

3.2.2 

3.2.3 

3.2.4 

3.3.1 

3.3.2 

October 2007 

October 2007 

November 2011 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

TN 890-13 or MB 890-8 

0.2.1 
SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T WARTUNGSHANDBUCH / MAINTENANCE MANUAL

0.2 Verzeichnis der Seiten / List of effective pages

Seite / Page Datum / Date Bezug / Reference 

4.1 

4.2.1 

4.2.2 

4.2.3 

4.3 

5.1.1 

5.1.2 

5.2.1 

5.2.2 

5.3 

5.4.1.1 

5.4.1.2 

5.4.2 

5.5 

5.6 

5.7.1 

5.7.2 

5.8.1 

5.8.2 

5.9 

5.10 

5.11 

6.1 

6.2.1 

6.2.2 

6.3 

6.4.1 

6.4.2 

6.4.3 

6.5 

6.6.1 

6.6.2 

6.7 

6.8 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

October 2007 

November 2011 

October 2007 

October 2007 

November 2011 

October 2007 

November 2011 

October 2007 

TN 890-13 or MB 890-8 

TN 890-13 or MB 890-8 

TN 890-13 or MB 890-8 

0.2.2 
	

	



 	
   
   


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SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T MAINTENANCE MANUAL

 Diagrams:

 1 Control circuits in the fuselage Oct. 2007 

 2 Rudder control circuits Oct. 2007 

 3 Control circuits in the wing Oct. 2007 

 4 Undercarriage with retracting linkage and hydraulic disc brake Oct. 2007 

 5 Inspection opening in the aileron web Oct. 2007 

 6 Inspection opening in the fin Oct. 2007 

 7 Aileron template Oct. 2007 

 8 Power plant installation Oct. 2007 

 9 Wiring diagram avionic Nov. 2011 

 10a Wiring diagram / power plant - 1 control unit Oct. 2007 

 10b Wiring diagram / power plant - 2 control units Oct. 2007 

 11 Connector I-panel / airframe Nov. 2011 

 12 Special tool for removal and re-installation 

 of the pylon gas strut Oct. 2007 

 

 Anti collision markings Duo Discus T Oct. 2007 

 Check list:

 

 1. Engine mount (pylon) and pivoting mechanism Oct. 2007 

 2. Fuel system Oct. 2007 

 3. Electrical system (power plant monitoring, engine test run) Oct. 2007 

 Trouble shooting lists Duo Discus T

 Page 1 Oct. 2007 

 Page 2 Oct. 2007 

 Page 3 Oct. 2007 

 Page 4 Oct. 2007 

 Repair Instruction Duo Discus T

 Page 1 Oct. 2007 

 Page 2 Oct. 2007 

 Page 3 Oct. 2007 

 Page 4 Oct. 2007 

 Repair Instructions for Schempp-Hirth Sailplanes and Powered Sailplanes 

constructed from Fiber Reinforced Plastic 

 It is recommended that Technical Notes (TNs) and Airworthiness 

 Directives (Ads) are inserted behind this page. 

November 2011 TN 890-13 / MB 890-8 

Revision 3 0.3.3 
	

	



 



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SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T MAINTENANCE MANUAL

To facilitate the checking of the empty mass centre of gravity, the table 

below shows ñ at different empty mass values ñ the maximum permissible load on the tail wheel, with various loads on the front seat and in 

relation to the most rearward c/g position. 

The actual load on the tail wheel is determined with the aircraft in 

weighing attitude, i.e. main wheel on the ground and tail jacked up as 

described on page 6.2.1. 

If the load on the tail wheel is below the value in the table, the empty 

mass centre of gravity is in front of the rearmost allowed limit for the 

corresponding minimum cockpit load and empty mass. 

Empty mass Load on tail wheel (or skid) with a minimum seat load of: 

70 154 75 165 80 176 85 187 90 198 

kg lb kg lb kg lb kg lb kg lb kg lb 

400 882 39.9 88.0 41.5 91.5 43.1 95.0 44.7 98.6 46.3 102.1

410 904 40.4 89.1 42.0 92.6 43.6 96.1 45.1 99.4 46.7 103.0

420 926 40.8 90.0 42.4 93.5 44.0 97.0 45.6 100.6 47.2 104.1

430 948 41.3 91.1 42.9 94.6 44.5 98.1 46.1 101.7 47.6 105.0

440 970 41.7 91.9 43.3 95.5 44.9 99.0 46.5 102.6 48.1 106.1

450 992 42.2 93.1 43.8 96.6 45.4 100.1 47.0 103.6 48.6 107.2

460 1014 42.7 94.2 44.2 97.5 45.8 101.0 47.4 104.5 49.0 108.0

470 1036 43.1 95.0 44.7 98.6 46.3 102.1 47.9 105.6 49.5 109.1

480 1058 43.6 96.1 45.2 99.7 46.7 103.0 48.3 106.5 49.9 110.0

490 1080 44.0 97.0 45.6 100.5 47.2 104.1 48.8 107.6 50.4 111.1

500 1103 44.5 98.1 46.1 101.7 47.7 105.2 49.2 108.5 50.8 112.0

510 1125 44.9 99.0 46.5 102.5 48.1 106.1 49.7 109.6 51.3 113.1

520 1147 45.4 100.1 47.0 103.6 48.6 107.2 50.1 110.5 51.7 114.0

530 1169 45.8 101.0 47.4 104.5 49.0 108.0 50.6 111.6 52.2 115.1

Note:

Should a tail skid be fitted (instead of a tail wheel), the above values are 

to be multiplied by a factor of 0.993). 

November 2011 TM 890-13 / MB 890-8 

Revision 3 6.4.2 
SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T MAINTENANCE MANUAL

6.6 Useful load 

Load on the seats

*) Values as an example, the actually applicable

values - see Flight Manual log chart section 6.2 -

must be entered.

**) Enter number of batteries installed at weighing

and enlisted in equipment list.

***) With removed power plant the amendment "when

fuel tank is completely filled" must be crossed out.

1 batt. engine battery (E)

2 batt.** in front of rear stick mounting frame (C1, C2)**

1 batt.** beside U/C (C3)**

1 batt.** in fin (F1, F2)**

front

seat load

rear

seat load

LOAD ON THE SEATS

(crew incl. parachutes)

 70* kg

154* lb

Depending on its equipment and the installation of fixed trim ballast, the actual 

minimum front seat load and the maximum cockpit load of this particular Duo Discus 

T (to which this manual refers) may differ from the above entered values. 

The placards in the cockpit must always show the actual values, which are also to 

be entered in the log chart ñ see flight manual, page 6.2.3 or 6.2.4. 

Determination of the values for the maximum load in the cockpit and in the seats:

The maximum front seat load and 

The maximum rear seat load 

are always 110 kg. 

The maximum load in the cockpit when the fuel tank is completely filled must 

be determined in such a way that, with considering 12kg fuel load in the fuel tank, 

the maximum weight of the non-lifting parts and the maximum weight without water 

ballast is not exceeded (see Flight Manual page 2.6). 

With removed power plant the maximum load in the cockpit must be determined 

in the same way but without considering any fuel. 

Under certain conditions the maximum load in the cockpit may be lower than 220kg. 

In this case it is not possible to use the maximum seat load in both seats at the 

same time. 

November 2011 TN 890-13 / MB 890-8 

Revision 3 6.6.1 

The maximum load in the cockpit (load on both seats

 baggage + trim ballast) must not be exceeded.

 the front seat load is below the minimum front seat load:

e instructions in the flight manual - section 6.2.

SEAT

LOAD

TWO PERSONS

 min. max.

at

choice

ONE PERSON

 min. max.

110 kg

243 lb

Maximum load in the cockpit when

the fuel tank is completely filled ***

222* kg / 490* lb

+

If

se

Maximum

fuel

kg lb Ltr.. US. Gal. IMP. Gal.

12 26.5 16 4.23 3.52

valid for the following battery location(s):

110 kg

243 lb

 70* kg

154* lb

110 kg

243 lb
 SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK 

Duo Discus T MAINTENANCE MANUAL

6.7 Mass ñ C/G diagram

November 2011 

Additional permitted range with

optional water ballast fin tank 

MAXIMUM ALL-UP MASS

PERMITTED

RANGE

FOREMOST C/G POSITION

MINIMUM ALL-UP MASS

REARMOST C/G POSITION

ALL - UP MASS (kg / lb)

1543 700

lb kg

1433 650

1323 600

1213 550

1102 500

1654 750

1058 480

in flight (mm / in.) aft of datum

mm

in.

X

Revision 3 TN 890-13 / MB 890-8 6.7 
SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK

Duo Discus T MAINTENANCE MANUAL

November 2011

Revision 3 TN 890-13 / MB 890-8 8.1

Placing:

Baumuster:

Werk-Nr./Bj:

Ger‰te-Nr.:

Hersteller:

SCHEMPP-HIRTH

Flugzeugbau GmbH

Duo Discus T

/

EASA.A.074

8. Placards and pictograms

Cockpit inner skin on the right

in the rear

IDENTIFICATION PLATE

(fire resistant)

OPERATING LIMITS Cockpit inner skin on the left

for either seat

Cockpit inner skin on the left

in the rear

WEAK LINK FOR TOWING OPERATING LIMITS

Nose wheel : 3.0 bar (43 psi)

Main wheel : 4.0 bar (57 psi)

Tail wheel :

(if installed) 3.0 bar (43 psi)

for Aerotow: max. 850 daN (1910 lb)

for Winch launch: max. 950 daN (2135 lb)

TIRE PRESSURE

MAXIMUM PERMITTED SPEEDS (IAS) : km/h kt mph

Never exceed speed 262.8 142 163

Rough air speed 180 97 112

Maneuvering speed 180 97 112

Aerotowing speed 180 97 112

Winch launching speed 150 81 93

Landing gear operating speed 180 97 112

For power plant extension/retraction 110 59 68

With ignition ON 125 67 78

Power plant extended speed 160 86 99

PERMISSIBLE MINIMUM SPEED (IAS)

For power plant extension/retraction 90 49 56

Max. permitted speed

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

262.8

262.8

262.8

253

241

228

215

204

192

180

170

VNE(IAS)

km/h kt mph

142

142

142

137

130

123

116

110

104

 97

 92

163

163

163

157

150

142

134

127

119

112

106

Altitude

[m] [ft]

0

3281

6562

9843

13123

16404

19685

22966

26247

29528

32808

MAX. PERMITTED A.U. WEIGHT (MASS): 1654 lb / 750 kg

Cockpit inner skin on the right

for either seat

Operating Conditions: See Flight Manual

(A) Inside loops (C) Lazy eight

(B) Stalled turns (D) Spins

A E R O B A T I C S

With max. permitted A.U.weight of 630 kg / 1389 lbs,

without water ballast and power plant retracted or

removed the following maneuvers are permitted:
November 2011

Revision 3 TN 890-13 / MB 890-8 8.2

Placing:

Cockpit inner skin on

the right for either seat

(if installed) Cockpit inner skin on the right

(front seat only)

Outbd. end of main wing panels Locking device for outbd. wing panels

WHEN FLOWN SOLO, THE PLACARDED

MINIMUM FRONT SEAT LOAD MAY BE

REDUCED BY UP TO:

- 05 kg (11 lb) 1

- 10 kg (22 lb) 2

- 15 kg (33 lb) 3

- 20 kg (44 lb) 4

- 25 kg (55 lb) 5

- 30 kg (66 lb) 6

NUMBER OF LEAD

PLATES REQUIRED

LOCKING PIN FLUSH

WITH UPPER SURFACE

*) Values as an example, the actually applicable

values - see Flight Manual log chart section 6.2 -

must be entered.

**) Enter number of batteries installed at weighing

and enlisted in equipment list.

***) With removed power plant the amendment "when

fuel tank is completely filled" must be crossed out.

1 batt. engine battery (E)

2 batt.** in front of rear stick mounting frame (C1, C2)**

1 batt.** beside U/C (C3)**

1 batt.** in fin (F1, F2)**

front

seat load

rear

seat load

LOAD ON THE SEATS

(crew incl. parachutes)

 70* kg

154* lb

The maximum load in the cockpit (load on both seats

+ baggage + trim ballast) must not be exceeded.

If the front seat load is below the minimum front seat load:

see instructions in the flight manual - section 6.2.

SEAT

LOAD

TWO PERSONS

 min. max.

at

choice

ONE PERSON

 min. max.

110 kg

243 lb

Maximum load in the cockpit when

the fuel tank is completely filled ***

222* kg / 490* lb

Maximum

fuel

kg lb Ltr. US. Gal. IMP. Gal.

12 26.5 16 4.23 3.52

valid for the following battery location(s):

110 kg

243 lb

 70* kg

154* lb

110 kg

243 lb

SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK

Duo Discus T MAINTENANCE MANUAL

Note:

The stars (*,**,***) refer to the aside

mentioned comments. In the real

cockpit placard they are omitted.

WATER BALLAST IN THE FIN

The rear limit for the in-flight center of

gravity must not be exceeded.

Therefore for loading the fin tank strictly

follow the Flight Manual section 6.2!

Cockpit inner skin on

the right for either seat

(if installed)
SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK

Duo Discus T MAINTENANCE MANUAL

Placing:

November 2011

Revision 3 TN 890-13 / MB 890-8 8.3

Cockpit inner skin on

the right for either seat

O OPEN fuel shut-off valve

O Switch ASI to pitot head in nose

O Set speed to 90-100 km/h (49-54 kt, 56-62 mph)

O Ignition ON

O Only in manual operation: EXTEND power plant

O When power plant is fully extended:

PULL decompression handle and HOLD

O Accelerate to about 100 km/h (54 kt, 62 mph)

O RELEASE decompression handle

WITH ENGINE RUNNING:

O Climb at 90-100 km/h (49-54 kt, 56-62 mph)

CHECK LIST

EXTENDING AND STARTING THE POWER PLANT

O Reduce speed to about 90-100 km/h (49-54 kt, 56-62 mph)

O Ignition OFF

O Only in manual operation:

RETRACT power plant for 3 seconds

O Only in manual operation:

WHEN PROP HAS STOPPED: RETRACT power plant fully

O Switch ASI to pitot head in fin

O CLOSE fuel shut off valve

STOPPING AND RETRACTING THE POWER PLANT

Cockpit inner skin on the left

- for front seat only (unless a

2nd control unit is installed)

O Water ballast in fin tank correctly filled (if installed) ?

Dump all water ballast in case of doubt !

O Loading charts checked ?

O Parachute securely fastened ?

O Safety harness secured and tight ?

O Seat back, head rest and pedals in

comfortable position ?

O All controls and instruments easily accessible ?

O Airbrakes checked and locked ?

O All control surfaces checked with assistant

for full and free movement in correct sense ?

O Elevator trim correctly set ?

O ASI switched to Pitot head in fin ?

O Canopy closed and locked ?

CHECK LIST BEFORE TAKE-OFF