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S-LOD > Air Systems > Flashcards

Air Systems Flashcards

1
Q

(756) Describe the function of the Compartment Temperature (COMPT TEMP) controls and indicators

A
  • AUTO - Provides automatic compartment temperature control
  • OFF - Closes the associated compartment trim air valve and illuminates the compartment temperature INOP light

NOTE: The INOP light also illuminates for a fault in the associated zone temperature controller

(767 only) Flight Deck (FLT DK) Manual (MAN) control:

  • MAN - Provides manual control of the compartment trim air valve - the selector is spring loaded to the 6 O’clock position while in manual

NOTE: Selecting the MAN position does not illuminate the compartment temperature INOP light (control is still available).

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2
Q

(756) Recall the meaning of a Left or Right Engine (L/R ENG) Bleed OFF light

A

ENGINE BLEED AIR OFF LIGHT

  • Illuminated (amber) - engine bleed air valve is closed:

— Closes automatically due to a system fault
— Closed if the switch is OFF
— Closed if the engine is not operating

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3
Q

(756) Recall the indications of a dual auto pressurization controller failure

A

AUTO Inoperative (INOP) light

  • Illuminated (amber)

— AUTO 1 and AUTO 2 CABIN ALTITUDE CONTROL mode selector (MODE SELECT) functions are inoperative

— MAN mode selected

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4
Q

(756) Recall the meaning of the Cargo Heat Overheat (OVHT) light (767 only)

A

CARGO HEAT OVERHEAT (OVHT) lights

  • Illuminated (amber)

— The cargo compartment temperature is above the standard control range

— The shutoff valve has been signaled closed

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5
Q

(756) Describe the function of the trim air system

A
  • The trim air control system adds warm air to the pack output air
  • The pack controllers regulate the pack output air temperature to satisfy the temperature requirements of the compartment requiring the coolest air
  • If the TRIM AIR switch is OFF or the trim air system is inoperative, the packs attempt to maintain all compartments at an average temperature

TRIM AIR SWITCH

  • ON - The trim air valve is commanded open
  • OFF (ON not visible) - the trim air valve is commanded closed

TRIM AIR OFF LIGHT

  • Illiminated (amber) - the TIM AIR switch is OFF
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6
Q

(756) Describe the function of the grasper system

A

GASPER SYSTEM (as installed)

  • draws air from the forward cabin overhead air conditioning ducts and discharges it f rom gasper outlets in the passenger service units located above each passenger seat

NOTE: the 757 has no flight deck control for the gasper system. The 767 has a flight deck switch to control the gasper system

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7
Q

Recall the pressurization panel landing altitude (LND ALT)

A

Must be reset in the indicator during a diversion

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8
Q

Discuss the purpose of the recirculating fans

A
  • The recirculation fans maintain overall cabin air circulation while allowing a reduction of cabin air ventilation, permitting the packs to be operated at a reduced flow. This reduces bleed air demand from the engines, reducing fuel burn

NOTE: On the 757 only, the Left Recirulation fan (L RECIRC FAN) switch should not be turned off because of its equipment cooling function.

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9
Q

Explain how to manually control the cabin altitude

A
  • Position the cabin altitude mode selector (MODE SELECT) to manual (MAN)
  • Move the cabin MANUAL control to CLIMB or DESCEND as needed to control the cabin rate and altitude
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10
Q

Recall the location, functions, and preflight position of the BULK CARGO HEAT selector (767 only)

A

BULK CARGO HEAT SELECTOR

  • The BULK CARGO HEAT selector is located on the P-61 accessory panel
  • Normal (NORM) - standard cargo heating range
  • Ventilation (VENT) - requests a higher temperature control range than NORM and turns on a ventilating fan for the bulk cargo compartment

NOTE: The preflight position is VENT

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11
Q

Recall the functions of the equipment cooling selector positions (767 only)

A

EQUIPMENT COOLING (EQUIP COOLING) SELECTOR

  • AUTO - automatically controls equipment cooling system
  • STBY - positions the equip cooling system for inboard airflow
  • OVRD - positions the equip cooling system for reverse air flow and arms the NO COOLING light
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12
Q

Explain the meaning of a PACK OFF light

A

PACK OFF LIGHTS

  • Illuminated (amber) - the pack valve is closed

NOTE: the pack is OFF

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13
Q

Explain the meaning of a PACK inoperative (INOP) light

A

PACK INOPERATIVE (INOP) LIGHTS

  • illuminated (amber) -

— A pack outlet overheat has been detected

— A fault in the automatic control system has been detected

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14
Q

Explain the meaning of an illuminated GASPER OFF light

(767 only and as installed)

A

GASPER FAN OFF LIGHT

Illuminated (amber) - the GASPER fan switch is ON but the fan is not operating

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15
Q

Explain the meaning of an illuminated Recirculating Fan (RECIRC FAN) INOP light

A

RECIRCULATION FAN INOPERATIVE (INOP) lights

  • Illuminated (amber) -

— The recirculation fan is failed or is not operating

— The RECIRC FAN switch is OFF

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16
Q

Explain the meaning of an illuminated Equipment Cooling (EQUIP COOLING) OVHT light

A

(757) OVHT light

  • Illuminated (amber) - insufficient air flow due to:

— insufficient airflow during ground ops

— Supply fan is INOP
Or
— the alternate supply fan is inop

(767) OVHT light

  • Illuminated (Amber) - high temp or low airflow in the equip cooling system
17
Q

Explain the function of the OFF, AUTO, and STBY positions of the pack control selectors

A

PACK CONTROL SELECTORS

  • OFF - closes pack valve
  • AUTO - the pack is automatically controlled
  • STBY:
    — N (normal) - regulates the pack outlet temp to a constant, moderate temp
    — C (cool) - sets the pack to full cold operation
    — W (warm) - sets the pack to full warm operation

NOTE: the automatic controller is bypassed in the standby position

18
Q

Explain the meaning of an illuminated CABIN ALTITUDE light on the overhead panel and an illuminated CABIN ALT light on the center forward (discrete) panel

A

CABIN ALTITUDE Light

  • Illuminated (RED) -
    — The cabin altitude has exceeded 10k’
    — The light extinguishes when the cabin altitude descends below 8.5k’
19
Q

Explain the operation of the cabin altitude AUTO RATE control

A

Cabin Altitude AUTO RATE control

  • Functions only if AUTO 1 or AUTO 2 is selected
  • Rotate - stets the limit for cabin altitude rate of climb or descent during auto control
  • The index mark is the proper preflight position
20
Q

Explain the meaning of an illuminated NO COOLING light on the EQUIP COOLING panel

(767 only)

A

NO COOLING light

  • Illuminated (amber)

— Active in the OVRD position only

— No reverse air flow through the E/E compartment avionics

21
Q

Recall the meaning of an illuminated compartment temperature INOP light

A

Compartment Temperature Inoperative (INOP) lights

Illuminated (amber)

  • The compartment temp control is selected OFF

Or

  • A fault has occurred in the zone temp controller while operating in AUTO

Or

  • The TRIM AIR switch is selected OFF

NOTE: selecting the TRIM AIR switch OFF will cause all compartment temp INOP lights to illuminate

22
Q

Explain why the center isolation (C ISLN) switch is guarded

(767 only)

A
  • To protect the air source to the ADP
23
Q

Recall the meaning of an illuminated DUCT LEAK light

A

DUCT LEAK lights

Illuminated (amber)

  • high temp bleed air leak detected
24
Q

Recall the meaning of an illuminated Engine BLEED light

A

Engine BLEED lights

  • “Bleed Air Malfunction” is Delta recommended answer
  • Vol 2 detailed answers are also acceptable
25
Q

Recall the meaning of an illuminated Engine HI STAGE / OVHT light

A

Engine HIGH STAGE / OVHT light

  • “Bleed Air Malfunction” Delta recommended answer
  • Other Vol 2 answers acceptable

S-LOD (13 decks)

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