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[4] Three red manual extension handles are located on the floor of the flight
compartment, just aft of the first officer's station, for manual extension of the
landing gear in case of hydraulic malfunction in hydraulic system "A". The manual
extension handles are independently operated for each gear. The landing gear
selector lever should be in the OFF position for manual extension.
[5] The main gear provides the support for the aft section of the fuselage. It uses a
shock strut to absorb impact on landing, and shocks and vibration while taxiing.
Each main gear is hydraulically actuated to retract inboard into the fuselage. Doors
and wheel well seals provide fairing with the gear retracted. Lock mechanisms and
sensors assure that the main gear is down and locked or up and locked.
Fig 14-2 main gear
[6] The nose gear , located below the aft bulkhead of the control cabin, provides the
support for the forward section of the fuselage. The nose gear includes a drag brace,
shock strut, torsion links, a hydraulic nose gear actuator and a hydraulic lock
actuator . The shock strut consists of inner and outer cylinders. The upper part of
the outer cylinder is "Y" shaped with arms extended to the sidewalls of the wheel
well . Trunnion pins connect the gear to airplane structure. The "Y" arms and pins
provide lateral stability. The gear rotates about the trunnion pins during extension
and retraction. A tow lug and crossbolt are installed for attaching a tow bar to the
nose gear.
Fig 14-3. Nose gear
[7] Shocks and bumps during taxi, take off and landing are absorbed by the shock
strut which contains oil and is charged with compressed air or nitrogen.
Longitudinal stability is provided by a hinged drag brace which folds upward and
aft during gear retraction. For steering, the shock strut inner cylinder turns within
the outer cylinder.Torsion links connected at the upper end to a steering collar and
at the lower end to the shock strut inner cylinder transmit a turning moment
supplied by hydraulically actuated steering cylinders. The steering is controlled by
the handwheel on the pilots sidewall or by the rudder pedals. The handwheel can
turn the nose wheel 78 from center and the rudder pedals at full deflection can turn
the nose wheels 7 from center.
EXERCISE
A. Find out the explanations of the following words in your “English-Chinese
Technical dictionary ”
1. main gear [ P1-97 ]
2. nose gear [P1-107 ]
3. spar [P1-139 ]
4. disarm [P1-45 ]
5. solenoid [P1-138 ]
6. configuration [P1-34 ]
7. shock strut [P1-134 ]
8. taxi [P1-150 ]
9. drag brace [P1-48 ]
10. drag strut [P1-48 ]
11. torsion link [P1-157 ]
12. towing lug [P1-158 ]
B. Translate the following sentences into Chinese
1. The landing gear consists of two main gear and a nose gear, the main gear are
located inboard of each engine aft of the rear wing spar, the nose gear is located
below the aft bulkhead of the flight deck .
2. The landing gear is hydraulically actuated to extend and retract by means of
landing gear selector lever. When the selector lever is placed in the UP position,
all three gear retract.
3. The main gear provides the support for the aft section of the fuselage, it uses a
shock strut to absorb impact on landing and shocks and vibration while taxiing.
4. The shock strut consists of inner and outer cylinders, the upper part of the
outer cylinder is "Y" shaped with arms extended to the sidewalls of the wheel
well.
5. The nose wheel steering is controlled by the handwheel on the pilots sidewall
or by the rudder pedals, the handwheel can turn the nose wheel 78 from
center.
LESSON 15
FLIGHT CONTROLS
VOCABULARY
1. flight [ flait ] n. ; v. 飛行
2. control [ kn'trul ] n. ; v. 操縱; 控制
3. maneuver [ mnu:v ] n. ; v. 機動動作(飛行)
4. lateral [ lætrl ] a. 橫向的; 水平的
5. longitudinal [ l nd itju:dinl ] a. 縱向的; 經線的
6. vertical [ v:tikl ] a. 垂直的; 豎向的
7. axes [ æksi:z ] 是復數形式,axis [ æksis ] 是單數形式; 軸
8. increase [inkri:s ] v. 增加; 上升; 提高
9. lift [ lift ] n. 升力
10. takeoff [ teik :f ] n. 起飛
11. landing [ lændi ] n. 著陸
12. drag [ dræg ] n. 阻力
13. ground [ graund ] n. 地面; 接地
14. are divided into …… 被分成(為)…
15. group [ gru:p ] n. 組; 類; 集團
16. primary [ 'praimri ] a. 主要的
17. secondary [ sekndri ] a. 次要的
　
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