Jonker Sailplanes JS3 Technical specifications

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page i
JS-MD 3 AIRCRAFT FLIGHT MANUAL
Type:
JS-MD Single
Model:
JS-MD 3
Marketing name:
JS-3 Rapture
Serial number:
Registration number:
Document number:
MD10-AFM-00-001
Title:
JS-MD 3 Aircraft Flight Manual
Issue
01
Date of issue
14-Feb-20
Responsible for content
Sören Pedersen / HOA
The technical content of this document is approved under the authority
of the DOA ref. EASA.21J.603.
Sections 2, 3, 4 and 5.2 are approved by the EASA through
EASA.A.616.
Copyright ©:
M&D Flugzeugbau GmbH & Co.KG
Streeker Straße 5b 
D-26446 Friedeburg
-All rights reserved-

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page ii
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JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–1
0 Document Management
Record of revision
Issue
Date
Reason for Change
00
24.04.2019
Initial Issue
01
14.02.2020
Section 2.11: Aircraft compass removed from minimum
equipment list
Section 2.12: Value of aerotow weak link amended to
600daN
Fig 2.14-1 Limitation Placard replaced
Fig 2.14-1 Cockpit Masses Placard replaced
Fig. 4.4-1 Pre-flight and pre take-off placard amended
Fig. 4.5-4 Vne Chart placard amended
Section 4.5.6 Park brake caution added
Table 5.3-1 Polar coefficients added
Section 6.2 updated with fuselage tank fitted instead of
Jet
Section 6.3 & 6.4 Max. fuel masses corrected
Section 6.3 & 6.4 Mass of expendable tail tank
corrected to 5.8 kg
Section 6.3 & 6.4 Mass and lever arm of fixed tail (lead)
ballast corrected
Section 6.3 & 6.4 Non-expendable tail tank (top) mass
changed to ±3.9
Section 6.3 Labels of Non-expendable tail tanks
changed to 10.1 and 10.2 in Table 6.3-2 and Figure 6.3-
2

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–2
Table 6.4-5 Lever arm of the non-expendable tail tank
corrected to 4510 mm
Figures 6.4-1, 6.4-2 & 6.4-3 removed
Section 7.8.2.1 –minor text modifications
Section 7.8.2.1, 7.8.2.2 , 7.8.3.1, 7.8.3.2 Heading added.
Caution note added in section.
Section 7.8.3 18m tip figure updated
Sections 7.8.4.1 & 7.8.4.2 added
Section 7.11 electrical system and battery descriptions
amended
Section 7.11.3: Master Switch Arrangement diagram
changed with added L, R and C labels for batteries
Section 7.11 Master Switch and battery selection
placards amended
Section 8.4 Long-term storage duration period added

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–3
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Section
Revision
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Number
of Pages
Reference
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00
14.02.2020
8
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JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–4
Record of amendments
Date of Issue/
Revision
Date of
Insertion
Signature

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–5
Table of contents
JS-MD 3 AIRCRAFT FLIGHT MANUAL ................................................i
0Document Management ..........................................................0–1
Record of revision .............................................................0–1
List of effective sections ....................................................0–3
Record of amendments.....................................................0–4
Table of contents...............................................................0–5
1General......................................................................................1–1
Introduction........................................................................1–1
Certification basis..............................................................1–1
Warnings, cautions and notes...........................................1–2
Descriptive data.................................................................1–3
Technical data...................................................................1–4
Three-view drawing...........................................................1–5
2Limitations................................................................................2–1
Introduction........................................................................2–1
Airspeed limits...................................................................2–2
Power plant fuel and oil.....................................................2–5
Power plant instrument markings......................................2–5
Mass..................................................................................2–6
Centre of gravity................................................................2–8
Approved manoeuvres ......................................................2–9
Flight load factor limits.....................................................2–11
Flight crew.......................................................................2–12
Types of operation...........................................................2–13
Minimum equipment list...................................................2–14
Aerotow and winch launching .........................................2–15

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–6
Other limitations ..............................................................2–16
Limitations placards.........................................................2–19
3Emergency procedures...........................................................3–1
Introduction........................................................................3–1
Canopy jettison..................................................................3–1
Bailing out..........................................................................3–2
Stall recovery.....................................................................3–3
Spin recovery ....................................................................3–4
Spiral dive recovery...........................................................3–5
Excessive sideslip recovery ..............................................3–6
Engine failure –Jet turbine................................................3–7
Engine Fire........................................................................3–7
Electrical fire......................................................................3–8
Other emergencies............................................................3–9
4Normal operating procedures..................................................4-1
Introduction.........................................................................4-1
Rigging and de-rigging.......................................................4-1
Daily inspection ..................................................................4-8
Pre-flight check.................................................................4-13
Normal procedures and recommended speeds...............4-15
5Performance ..............................................................................5-1
Introduction.........................................................................5-1
Approved data....................................................................5-1
Non-approved information..................................................5-4
6Weight and balance ..................................................................6-1
Introduction.........................................................................6-1
Weight and balance record ................................................6-1

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–7
Permitted payload-range and CG envelope.......................6-3
Optimisation of centre of gravity.......................................6-11
7System description...................................................................7-1
Introduction.........................................................................7-1
Cockpit controls..................................................................7-1
Landing gear system........................................................7-15
Seats and safety harness.................................................7-16
Pneumatic system............................................................7-17
Airbrake system................................................................7-19
Baggage compartment.....................................................7-20
Water ballast system........................................................7-21
Power plant ......................................................................7-30
Fuel system......................................................................7-30
Electrical system ..............................................................7-31
Miscellaneous equipment.................................................7-36
8Handling and maintenance ......................................................8-1
Aircraft inspection periods..................................................8-2
Ground handling.................................................................8-3
Cleaning and care ..............................................................8-5
Long-term storage..............................................................8-8
9Supplements..............................................................................9-1
Introduction.........................................................................9-1
List of ancillary equipment..................................................9-1
10 Service bulletins......................................................................10-1
11 STCs and minor change approvals.......................................11-1
12 Contact.....................................................................................12-1
Type Certificate Holder.....................................................12-1

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 0–8
Manufacturer / Maintenance.............................................12-1

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–1
1 General
Introduction
This Flight Manual has been prepared to provide pilots and instructors
with all the information required for safe and efficient operation of the JS-
MD 3. All the data that is required by the Airworthiness Requirement CS-
22 to be provided to the pilot is contained in this manual. It also contains
supplementary data supplied by the aircraft manufacturer.
The JS-MD 3 is a high-performance aircraft and not a trainer. Even
though it possesses excellent performance and handling qualities, it can
only be flown by a skilled pilot who complies with the limitations and
recommendations set out in this manual.
If a Jet Sustainer System is fitted, use this manual in combination with
the latest approved JS-MD 3 Jet Sustainer Flight Manual Supplement.
The marketing name for model JS-MD 3 is the JS-3 Rapture, and
referred to in this manual as the JS-3.
Certification basis
This aircraft, with production designation JS-MD Single model JS-MD 3
has been approved by the European Aviation Safety Agency (EASA) in
accordance with CS-22 Amendment 2 and the Type Certificate No.
EASA.A.616 has been issued accordingly.
The JS-MD 3 is of category U (Utility).

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–2
Warnings, cautions and notes
The following definitions apply to warnings, cautions and notes used in
this Flight Manual.
WARNING: Means that the non-observation of the corresponding
procedure leads to an immediate or important
degradation in flight safety.
CAUTION: Means that the non-observation of the corresponding
procedure leads to a minor or to a longer-term
degradation in flight safety.
NOTE: Draws the attention on any special item not directly
related to safety but which is important or unusual.

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–3
Descriptive data
The JS-MD 3 is a high-performance single-seat aircraft of conventional
layout with a T-tail. Two wingspan configurations (15 m and 18 m) can
be selected, both of which feature full-span flaperons.
The cockpit is designed to protect the pilot in the event of a crash. Safety
features include a crumple zone in the forward structure. The wing
structure consists of spar caps made of carbon fibre rovings and skins of
carbon fibre fabric. The wings are connected with a tongue and fork
arrangement, secured with one main pin. The airbrakes are a triple blade
design on the upper surface of the wing.
Boundary layer control is achieved on the main wing bottom surfaces,
the horizontal stabilizer and vertical fin. All control surface hinge gaps are
sealed with Mylar strips and Teflon-coated tape.
The water ballast system consists of two main tanks and two trim tanks
in the vertical fin. Each main tank is integral to a wing and can hold
approximately 78 litres of water. The tail ballast tanks consist of an
expendable tank of approximately 5.8 litres and a non-expendable tank
of approximately 8.9 litres. The 18 m wing tips feature additional integral
tanks, with a capacity of approximately 17 litres each. The landing gear
consists of a 5-inch retractable sprung main landing gear with a
pneumatic retractable tail wheel.
All controls are automatically connected during rigging.
A retractable Jet engine, approved for sustained flight, can be fitted
optionally.

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–4
Technical data
Geometry
JS-3 15 m
JS-3 18 m
Wing span
15 m / 49.21 ft
18 m / 59.06 ft
Wing area
8.75 m² / 94.18 ft2
9.95 m² /
107.10 ft2
Aspect ratio
25.4
32.8
Fuselage length
6.86 m / 22.51 ft
Fuselage height
1.35 m / 4.42 ft
Weight
JS-3 15 m
JS-3 18 m
Maximum weight
525 kg / 1157 lbs
600 kg / 1323 lbs
Empty Weight
(without engine)
270 kg / 595 lbs
282 kg / 622 lbs
Empty weight (minimum
options with engine)
286 kg / 631 lbs
298 kg / 657 lbs
Maximum weight without
water ballast
415 kg / 916 lbs
430 kg / 948 lbs
Wing load (min)
(70kg pilot)
40.0 kg/m² /
8.2 lb/ft2
37.0 kg/m² /
7.58 lb/ft2
Wing load (max)
60.0 kg/m² /
12.3 lb/ft2
60.3 kg/m² /
12.35 lb/ft2
Glide performance
JS-3 15 m
JS-3 18 m
Best glide ratio
50
55
Best glide speed at MTOM
flap setting 4 (9°- 13.5°)
125 km/h
67 kts
120 km/h
65 kts
Best glide speed at 450 kg
flap setting 4 (9 ° - 13.5°)
110 km/h
59 kts
105 km/h
57 kts
Sink rate
(200 km/h / MTOM)
1.57 m/s
309 ft/min
1.60 m/s
315 ft/min
Table 1.5-1 Technical data

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–5
Three-view drawing
JS-3 15 m
Figure 1.6-1 JS-3 15 m

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 1–6
JS-3 18 m
Figure 1.6-2 JS-3 18 m

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 2–1
2 Limitations
Introduction
Section 2 includes operating limitations, instrument markings and basic
placards necessary for safe operation of the aircraft, its engine (if fitted),
standard systems and standard equipment.
The limitations included in this section have been approved by the EASA.

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 2–2
Airspeed limits
Speed limitations and their operational significance are shown in Table
2.2-1 below:
Speed
IAS
Remarks
VNE
Never exceed speed
280 km/h
151 kts
Do not exceed this speed in any
operation and do not use more than
1/3 maximum control deflection.
VRA
Rough air speed
207 km/h
112 kts
Do not exceed this speed except in
smooth air, and then only with
caution. Examples of rough air are
lee-wave rotor, thunderclouds etc.
VA
Manoeuvring speed
207 km/h
112 kts
Do not make full or abrupt control
movements above this speed,
because under certain conditions
the aircraft may be overstressed by
full control movement.
VFE
Maximum flap
extended speed
See
Table 2.2-2
Do not exceed these speeds with
the given flap setting.
VW
Maximum winch
launching speed
150 km/h
81 kts
Do not exceed this speed during
winch or auto tow launching
VT
Maximum aerotow
speed
180 km/h
97 kts
Do not exceed this speed during
aerotow.
VLO
Maximum landing
gear operating speed
180 km/h
97 kts
Do not extend or retract the landing
gear above this speed.
VPO
Maximum power
plant extension &
retraction speed
Refer to JS-MD 3 Jet Sustainer Flight
Manual Supplement Section 2.2.
VPE
Maximum speed with
the power plant
extended
Table 2.2-1 Airspeed Limits