LDG, Brakes, ECS

Question 1

1. LDG is ___ controlled __ operated
2. MG held down by ___
3. NG held down by ___
4. All held up by ___

Answer 1

1. LDG is electrically controlled hydraulically operated
2. MG held down by mech locks
3. NG held down by over-center lock
4. All held up by hydraulic pressure

Question 2

1. NLG has __ __ that assists hyd actuator and emer extension
2. WOW
   - ground = no ___ to the LG Handle
   - air = enables __ system, ___, ___ and ___ LG handle

Answer 2

1. NLG has spring strut that assists hyd actuator and emer extension
2. WOW
   - ground = no electrical power to the LG Handle
   - air = enables hydr system, TCAS, pusher and energizes LG handle

Question 3

1. Main hydraulic system has a __, __ and __ (at __ PSI)
   - Press Switch turns on < ___ PSI / off > __ PSI
   - Amber [HYDR] when /= __ min

Answer 3

1. Main hydraulic system: pwr pack, motor and pump (3K PSI)
   - Press Switch turns on <2450 PSI / off 2800 +/- 75 PSI
   - Amber [HYDR] < 1800 PSI
2. Nitrogen backup at 2K PSI serves 2 functions
   - absorbs shocks in hyd system
   - will hold LG up for >/= 200 min

Question 4

Red CAWS [HYDR] and gong if

• Flight: __ on > __ min (after __” delay)
• Ground: ___ initiated >__ times in ___

Answer 4

Red CAWS [HYDR] and gong if

• Flight: power pack on > 10 min (after 30” delay)
• Ground: power pack initiated >6 times in 1 hour

Question 5

“Gear” audio and 3 Red UP when:

• __ and __
• __ and __
• __ and ___

Answer 5

“Gear” audio and 3 Red UP when:

• LDG up and Flaps >15
• LDG up w/low eng power and <130 KIAS
• Low power and RADALT <200’

Question 6

Emer Hydraulic System:
- Slow to = \_\_ KIAS
- LDG \_\_\_ down
— Releases \_\_ hyd press = \_\_ fall
— \_\_\_ the acft may help
\_\_\_: extend handle and lock (\_\_ strokes may be req’d)

Answer 6

Emer Hydraulic System:
- Slow to = 100 KIAS
- LDG handle down
— Releases up hyd press = gravity fall
— Yawingthe acft may help
Pump: extend handle and lock (60 strokes may be req’d)

Question 7

Brakes:

• Wear indicator check only valid if ___
• __ brake master cylinders, __ brake assemblies
• __ valve combines L/R inputs (whoever pushes harder controls)

Answer 7

Brakes:

• Wear indicator check only valid if parking brake is on
• 4 brake master cylinders, 2 brake assemblies
• Shuttle valve combines L/R inputs (whoever pushes harder controls)

Question 8

• ACS = ___ ___ ___; increases temp and press bleed to heat, cool and ____.
• Bleed changeover Pressure Sw: opens HP s/o valve at __ psi, closes at __ psi
• HP SOV: lets __ bleed into system when __ insufficient (~<5 TRQ)

Answer 8

• ACS = Air Cycle System; increases temp and press bleed to heat, cool and pressurize.
• Bleed changeover Pressure Sw: opens HP s/o valve at 43 psi, closes at 36 psi
• HP SOV: lets P3 bleed into system when P2.5 insufficient (~<5 TRQ)