AIRCRAFT
DA 42 NG AMM
Landing Gear
Doc # 7.02.15
Rev. 4
32-30-00
Page 1
15 Mar 2018
Section 32-30
Extension and Retraction
1. General
This Section tells you about the components that extend and retract the landing gear. It tells you how
the system operates in normal operation and it tells you how the systems operates in an emergency.
Refer to Section 32-10 for data about the main gear legs. Refer to Section 32-20 for data about the
nose gear leg. Refer to Section 32-60 for data about the landing gear position and warning system.
Refer to the wiring manual for data about the related electrical systems.
2. Description
Figure 1 shows the main components of the of the extension and retraction system. Figure 2 shows
the main landing gear extension and retraction system and Figure 3 shows the nose landing gear
extension and retraction system. The landing gear has a dedicated hydraulic system to extend and
retract the legs. Folding stays that attach to the legs and the surrounding structure unfold to lock the
legs in the extended position. A spring operated latching mechanism holds the folding stays in a
geometrically locked position. The initial movement of the gear actuator when moving to retract the
landing gear operates the mechanism to unlock the folding stay. As the gear retracts, the folding stay
folds and retracts into the landing gear bay with its related leg. The landing gear extension and
retraction system has these main components:
A. Hydraulic Actuators
The hydraulic actuators are located in the related main gear bay. The actuators use hydraulic fluid
pressure to extend and retract the airplane landing gear during normal operation of the system.
B. Folding Stays
Each landing gear leg has a folding stay. The folding stay holds the extended leg locked in the
down position. When the leg extends to the fully down position the folding stay unfolds and a
latching mechanism locks the stay in the unfolded position. When the pilot retracts the landing gear
the hydraulic actuator operates a mechanism to unlatch the folding stay. The folding stay then folds
into the landing gear bay with the landing gear.
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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