AIRCRAFT
Hydraulic Power
DA 42 NG AMM
Trouble
Possible Cause
Repaired Items/References
Page 104
15 Mar 2018
29-10-00
Doc # 7.02.15
Rev. 4
Landing gear is extending slow
and erratic.
Dump valve is not fully closed
(high re-pump cycles).
Open up the dump valve fully,
then close the dump valve.
Tighten hexagon socket with
6 - 10 Nm (4.4 - 7.4 lbf.ft.).
Tighten counter nut with 8 Nm
(5.9 lbf.ft.).
See Figure 1.
Motor/Pump is not pumping
enough hydraulic fluid.
S
Power supply low.
Check power supply.
Hydraulic pump does not
switch off after
extending/retracting the
landing gear.
Dump valve is not fully closed
(high re-pump cycles).
Close dump valve. Tighten
hexagon socket with 6 - 10 Nm
(4.4 - 7.4 lbf.ft.). Tighten
counter nut with 8 Nm
(5.9 lbf.ft.).
See Figure 1.
Solenoid valves are not fully
closing.
Leakage caused by dirt or low
supply voltage.
High rate of re-pump cycles or
permanent operation of the
pump.
Check power supply and
solenoid valves.
Replace solenoid valve. Refer
to Section 29-10.
Pump pressure switch is
damaged.
Check switching points (refer to
pump pressure switch
operation test).
Replace pump pressure switch.
Refer to Section 29-10.
Pressure limitation valve is not
working properly. Wrong
system pressure.
Check pressure limitation
valve. Refer to Section 29-10.
Replace pressure limitation
valve. Refer to Section 29-10.
Summary of Contents for DA 42 NG
Page 933: ...AIRCRAFT DA 42 NG AMM Fuel Doc 7 02 15 Rev 4 28 TITLE Page 1 15 Mar 2018 CHAPTER 28 FUEL ...
Page 1459: ...AIRCRAFT DA 42 NG AMM Lights Doc 7 02 15 Rev 4 33 TITLE Page 1 15 Mar 2018 CHAPTER 33 LIGHTS ...
Page 1711: ...AIRCRAFT DA 42 NG AMM Doors Doc 7 02 15 Rev 4 52 TITLE Page 1 15 Mar 2018 CHAPTER 52 DOORS ...
Page 1853: ...AIRCRAFT DA 42 NG AMM Wings Doc 7 02 15 Rev 4 57 TITLE Page 1 15 Mar 2018 CHAPTER 57 WINGS ...
Page 2071: ...AIRCRAFT DA 42 NG AMM Engine Doc 7 02 15 Rev 4 72 TITLE Page 1 15 Mar 2018 CHAPTER 72 ENGINE ...
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