AIRCRAFT
Hydraulic Power
DA 42 NG AMM
Trouble
Possible Cause
Repaired Items/References
Page 106
15 Mar 2018
29-10-00
Doc # 7.02.15
Rev. 4
Re-pump cycles are too high
(more than 1 cycle per
45 min).
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.
Pre-fill pressure in hydraulic
accumulator is too low.
Check accumulator pressure.
Refer to Section 29-10.
Charge accumulator to
appropriate pressure.
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.
Emergency extension slow or
not completed.
High stream resistance in the
hydraulic system.
Check hydraulic hoses for
damage.
Note:
Emergency extension does not fully extend on the ground because of missing
aerodynamic forces. Pull the gear backwards to extend it fully!
Pressure in the hydraulic
reservoir.
Open FILL plug on the
hydraulic reservoir to check if
pressurized.
Send reservoir to vendor.
High friction on landing gear
legs and/or actuators.
Remove hydraulic actuators
and move the landing gear
manually.
Send hydraulic actuators to
vendor (Rev. B of main gear
and Rev. A of nose gear have
friction optimized piston
sealings). Refer to Section
32-20.
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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