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AIRCRAFT
DA 40 Series
AMM
Standard Practices and
Structures
Doc # 6.02.01
Rev. 5 51-80-00 Page 3
20 Sep 2007
The following design features also give lightning protection:
) The aluminum tubes of the lightning conductor system are also used as conduits for electric wires.
) Carbon fiber material is used for the lower wing skin and parts of the fuselage skin, canopy frame
and rear door frame. Carbon fiber material is conductive.
) Carbon fiber material with interwoven aluminum fibers is used for the upper wing skin and the
engine cowlings. Carbon fiber material with interwoven aluminum fibers is conductive.
) The forward wing spar separates the lightning conductor system from the fuel tanks.
) A lightning conductor strip is integrated in the horizontal stabilizer.
) The tail skid has an aluminum bar on the lower edge.
) The propeller is non-conductive (except for the erosion sheath), therefore currents cannot flow in
structural parts of the propeller. The propeller spinner is made from aluminum and is connected to
electrical ground.
AIRCRAFT
Standard Practices and
Structures
DA 40 Series
AMM
Page 4
20 Sep 2007 51-80-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Standard Practices and
Structures
Doc # 6.02.01
Rev. 5 51-80-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to do a test of the electrical bonding system.
2. Test the Electrical Bonding System
The resistance measurements on the DA 40 are divided into three categories:
) Very low resistance measurements for conduits in the direct lightning path and electrical power
grounds.
) Low resistance measurements for bondings of controls.
) High resistance measurements for the static discharge wicks.
Do the low resistance bonding measurements with a milliohmmeter and Kelvin probes. The test current
must be approximately 2 amps.
Do the high resistance measurements with a high voltage megaohmmeter. Measure the static
discharge wicks and the precautions against static charge of the airplane.
All measurements are referenced to the negative pole of the main battery. The airplane must be in a
serviceable condition during the tests, except that the engine cowlings must be removed.
A. Very Low Resistance Measurements (Lycoming version)
Item Attachment Point
max.
allowable
[mΩ]
measured
[mΩ]
passe
d
Engine flat area above alternator 0.3
Starter case 0.5
Alternator case 0.5
Oil Cooler case 2.0
External power connector outer large pin 1.2
Nose landing gear tube 10.0
Instrument panel above co-pilot's left knee 2.0
Engine breather tube 6.0
Voltage regulator baseplate 3.0
AIRCRAFT
Standard Practices and
Structures
DA 40 Series
AMM
Item Attachment Point
max.
allowable
[mΩ]
measured
[mΩ]
passe
d
Page 202
20 Sep 2007 51-80-00 Doc # 6.02.01
Rev. 5
FUEL SYSTEM
Fuel flow sensor case 3.0
Fuel drain/gascolator case 10.0
Fuel pump case 8.0
Fuel selector case 6.0
Fuel drain protector sheet metal 6.0
LH tank refill ring 5.0
LH tank vent plate 10.0
LH fuel tank drain drain 5.0
RH tank refill ring 5.0
RH tank vent plate 10.0
RH fuel tank drain drain 5.0
EXTERNAL
CONDUCTIVE PARTS
LH step 5.0
RH step 5.0
OAT sensor 5.0
LH landing gear lower bend, inner side 10.0
RH landing gear lower bend, inner side 10.0
RH canopy hinge tube tip 100
LH canopy hinge tube tip 100
ANTENNAS
COM 1 antenna (top) mounting screws 6.0
COM 2 antenna (bottom) mounting screws 6.0
AIRCRAFT
DA 40 Series
AMM
Standard Practices and
Structures
Item Attachment Point
max.
allowable
[mΩ]
measured
[mΩ]
passe
d
Doc # 6.02.01
Rev. 5 51-80-00 Page 203
20 Sep 2007
STABILIZER
Vertical lightning protection
tube
upper end 7.0
LH horizontal stabilizer
lightning strap
tip 15.0
RH horizontal stabilizer
lightning strap
tip 15.0
Tail fin aluminum bar 15.0
Rudder hinge rudder side 10.0
Vertical stabilizer fairing FWD LH side screw 12.0
Vertical stabilizer fairing FWD RH side screw 12.0
Horizontal stabilizer front bracket 10.0
Horizontal stabilizer rear bracket 10.0
LH WING
Aileron push-rod
attachment
bracket, aileron 50.0
Flap asymmetrical tube bonding strap connection 10.0
　
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本文鏈接地址：鉆石40系列AMM 2(124)