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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 DA20-C1 uses 2 types of standard bolt: AN3 through AN20 and DIN 985 specifications. You
can identify the bolt type by the marking on the head and the surface treatment.
The DA20-C1 uses these types of standard nut: AN364, AN365, MS21042, MS21044.
Standard Practices
Airframe
DA20-C1 AMM
Page 2
19 Dec 1997 20-00-00 Doc # DA201-C1
Rev. 0
3. Standard Torque Values
These tables show the maximum permissible torque values for bolts and nuts to AN and DIN
specifications:
A. AN Fine Thread Series
Bolt Size Torque (Nm) Torque (ft.lbs)
10 - 32 1.7 1.2
1/4 - 28 6.5 4.6
5/16 - 24 13.3 10
3/8 - 24 20.5 15.3
7/16 - 20 37.3 27.8
1/2- 20 54 40
9/16 - 18 90 66.7
5/8 - 18 123 91.7
B. AN Course Thread Series
Bolt Size Torque (Nm) Torque (ft.lbs)
10 - 24 1.7 1.2
1/4 - 20 5.6 4.2
5/16 - 18 10.1 7.5
3/8 - 16 20.8 15.4
7/16 - 14 28.6 21.3
1/2- 13 54.0 40.0
9/16 - 12 78.7 58.3
5/8 - 11 101.2 75.0
DA20-C1 AMM
Standard Practices
Airframe
Doc # DA201-C1
Rev. 9 20-00-00 Page 3
29 Apr 2004
C. DIN Specifications
Metric Thread Torque (Nm) Torque (ft.lbs)
M4 1.8 1.3
M5 3.6 2.7
M6 6.4 4.7
M8 16.0 11.8
M10 32.0 23.6
M12 60.0 44.4
Use the above torque values for all bolts/nuts/screws which meet the specifications unless they are
in the list of special torque values below.
4. Special Torques
Part Torque (Nm) Torque (ft.lbs)
Propeller to extension bolts 7/16 in (Sensenich) SEE SENSENICH W69EK7 MANUAL
DOC#W69EK7-CF REV F OR LATER
Propeller to extension bolts 3/8in (Hoffman) 23 - 25 17 - 18.4
Propeller to extension bolts 3/8in (Sensenich) 19.8 - 25.5 14.6 - 18.75
Propeller extension to engine flange bolts 1/2in 77 - 81 56.75 - 59.7
Spark plugs 34 - 40.8 25 - 30
Bolts attaching the engine mount to the firewall 34 - 35 25 - 25.8
Bolts attaching the engine to the isolators 20.4 - 21.5 15 - 15.8
Main landing gear bolt, inner Height of spring washers
4 ±0.5mm
0.16 ±0.02 in
Main landing gear bolts, outer 20 14.75
Brake back-plate bolts 8.5 - 9 6.25 - 6.7
Brake flexible hoses 4.5 - 6.8 3.3 - 5
B-Bolt nut in root rib 20 14.8
Safety belt attachment in center console Loose fit, NO torque
M10 bolt attaching generator to bottom
mounting bracket 35 26.3
M8 bolts attaching generator to top mounting
bracket and to engine 22 16.5
Engine See Continental IO-240-B
maintenance manual
Exhaust clamp bolts 2.3 – 2.8
or 3mm minimum
distance between ears
20 - 25 in lb
or 0.12” minimum
distance between ears
Exhaust pipe to cylinder head nuts 22.6 - 23.7 16.7 – 17.5
Standard Practices
Airframe
DA20-C1 AMM
Page 4
19 Dec 1997 20-00-00 Doc # DA201-C1
Rev. 0
5. Torque Measurement
For self-locking nuts, add the torque value of the locking device (friction or brake torque) to the
value in the table. Read the friction value from the torque wrench before the nut seats.
Where a bolt is tightened from the bolt-head, add the value of the shaft friction (the friction of the
bolt in the attached part) to the value in the table. Read the friction value from the torque wrench
before the bolt seats.
DA20-C1 AMM
Standard Practices
Airframe
Doc # DA201-C1
Rev. 0 20-00-00 Page 5
19 Dec 1997
6. Torque Conversion Graphs
Use graph 1 for conversion of torque values (Nm - ft lbs). And use graph 2 for conversion of
(Nm - in lbs).
Graph 1: Nm - ft.lb
Standard Practices
Airframe
DA20-C1 AMM
Page 6
19 Dec 1997 20-00-00 Doc # DA201-C1
Rev. 0
Graph 2: Nm - in.lb
DA20-C1 AMM
Heating and Ventilation
Doc # DA 201-C1
Rev. 0 21-TITLE Page 1
19 Dec 1997
CHAPTER 21
HEATING AND VENTILATION
Heating and Ventilation
DA20-C1 AMM
Page 2
19 Dec 1997 21-TITLE Doc # DA 201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Heating and Ventilation
Doc # DA 201-C1
Rev. 0 21-CONTENTS Page 1
19 Dec 1997
TABLE OF CONTENTS
CHAPTER 21-00 HEATING AND VENTILATION - GENERAL................................................................1
1. General .............................................................................................................................1
2. Description and Operation................................................................................................1
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