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AIRCRAFT
DA 40 Series
AMM
Standard Practices
Airframe
Doc # 6.02.01
Rev. 5 20-TITLE Page 1
20 Sep 2007
CHAPTER 20
STANDARD PRACTICES - AIRFRAME
AIRCRAFT
Standard Practices
Airframe
DA 40 Series
AMM
Page 2
20 Sep 2007 20-TITLE Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Standard Practices
Airframe
Doc # 6.02.01
Rev. 5 20-CONTENTS Page 1
20 Sep 2007
TABLE OF CONTENTS
CHAPTER 20
STANDARD PRACTICES - AIRFRAME
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Bolt and Nut Types Used in the Airplane . . . . . . . . . . . . . . . . . . . . . 1
3. Standard Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Special Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Torque Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
AIRCRAFT
Standard Practices
Airframe
DA 40 Series
AMM
Page 2
20 Sep 2007 20-CONTENTS Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Standard Practices
Airframe
Doc # 6.02.01
Rev. 5 20-00-00 Page 1
20 Sep 2007
OEV
8.8
AN-Bolt
Bolt Type Marking on Head Surface Treatment
DIN-Bolt
Corrosion resistant
steel bolts have a dash
Non-corrosion
resistant steel
bolts have an X
Manufacturer
Property class
Cadmium
Zink coated
CHAPTER 20
STANDARD PRACTICES - AIRFRAME
1. General
There are no maintenance practices which apply to the DA 40 airframe and its systems in general.
This Chapter only has data about standard threaded fasteners.
Always tighten the nut or bolt to the torque shown in the tables below. Always use the correct locking
device with the nut or bolt.
CAUTION: DISCARD SELF-LOCKING NUTS AFTER REMOVAL. THE FRICTION
TORQUE REDUCES WITH USE.
2. Bolt and Nut Types Used in the Airplane
The DA 40 uses 3 types of standard bolts: DIN 931 and LN9037 metric specifications and AN3 through
AN20 American specifications. You can identify the bolt type by the marking on the head and the
surface treatment.
The DA 40 uses these types of standard nuts: DIN 934, DIN 985, AN364, AN365, MS21042,
MS21044.
AIRCRAFT
Standard Practices
Airframe
DA 40 Series
AMM
Page 2
20 Sep 2007 20-00-00 Doc # 6.02.01
Rev. 5
3. Standard Torque Values
These tables show the correct torque values for bolts and nuts to AN and DIN specifications. Use the
following torque values for all bolts, nuts and screws which meet the specifications unless they are in
the list of special torque values below.
A. AN Fine Thread Series
Bolt Size Torque (Nm) Torque (ft.lb)
10 - 32 1.6 1.2
1/4 - 28 6.2 4.6
5/16 - 24 13.6 10
3/8 - 24 20.7 15.3
7/16 - 20 37.7 27.8
1/2 - 20 54.2 40
9/16 - 18 90.4 66.7
5/8 - 18 124.3 91.7
B. AN Coarse Thread Series
Bolt Size Torque (Nm) Torque (ft.lb)
10 - 24 1.6 1.2
1/4 - 20 5.7 4.2
5/16 - 18 10.2 7.5
3/8 - 16 20.9 15.4
7/16 - 14 28.9 21.3
1/2 - 13 54.2 40
9/16 - 12 79 58.3
5/8 - 11 101.6 75
AIRCRAFT
DA 40 Series
AMM
Standard Practices
Airframe
Doc # 6.02.01
Rev. 5 20-00-00 Page 3
20 Sep 2007
C. DIN and LN Specifications
Metric Thread Torque (Nm) Torque (ft.lb)
M4 1.8 1.3
M5 3.6 2.7
M6 6.4 4.7
M8 16 11.8
M10 32 23.6
M12 60 44.3
4. Special Torque Values
Part Torque (Nm) Torque (ft.lb)
Propeller to engine bolts. Lycoming version 85 - 90 62.7 - 66.4
TAE version 45 - 47 33.2 - 34.6
Spark plugs (Lycoming version only). 47 34.6
Bolts attaching the engine
to the shock mount.
' Lycoming version 55 40.6
Bolts attaching the engine mount to the firewall. 40 29.5
Nose wheel fork pivot nut. Refer to the procedure given in Section 32-40.
Main landing gear outer
attaching bolts.
unloaded 20 14.8
at static load 18 13.3
Main landing gear inner
attaching bolt.
height of spring
washers
4 mm
(+0.5 mm / -0 mm)
0.16 in
(+0.02 in / -0 in)
Main wheel. Refer to the procedure given in Section 32-10.
Nose wheel. Refer to the procedure given in Section 32-40.
' Horizontal stabilizer attaching bolts. 45 33.2
AIRCRAFT
Standard Practices
Airframe
DA 40 Series
　
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