Controls and Indications: Air Conditioning Flashcards
Flight (FLT) DECK FAN Switch
ON -
* recirculated cabin air supplied to flight deck fan
* operates on ground until first pack is on
Flight (FLT) DECK Temperature (TEMP) Selector
AUTO -
* provides automatic control of flight deck temperature
* range C to W sets flight deck temperature from 18°C to 29°C
* in backup mode, range C to W sets average flight deck temperature from 18°C to 29°C cabin temperature panel control of zone temperatures is inhibited, and automatic control of main deck zone temperature is inhibited
MAN (spring loaded to 6 o’clock position) - flight deck trim air valve controlled manually.
C (cool) - valve moves toward closed to provide cooler air.
W (warm) - valve moves toward open to provide warmer air.
ZONE Reset (RST) Switch
Push -
* resets zone temperature controller if fault no longer exists
* reopens master trim air valve if duct overheat no longer exists
* reopens forward or aft lower lobe cargo trim air shut off valve if duct overheat no longer exists
Zone System (SYS) FAULT Light
Illuminated (amber) -
* temperature zone duct overheat or zone temperature controller fault has occurred
* master trim air valve failed closed
* Trim Air switch off
* master trim air valve closed and pack air continues to flow
MAIN DECK Temperature (TEMP) Selectors
AUTO -
* provides automatic control of main deck conditioned air temperature
* range C to W sets temperature from 4°C to 29°C
* in backup mode, automatic control of main deck temperature is inhibited
MAN (spring loaded to 6 o’clock position) - main deck trim air valve controlled manually
C (cool) - valve moves toward closed to provide cooler air.
W (warm) - valve moves toward open to provide warmer air.
Forward (FWD) LOWER LOBE Temperature (TEMP) Selector
AUTO -
* provides automatic control of forward lower lobe cargo conditioned air temperature when Lower Lobe Cargo Conditioned Air Flow Rate selector in FWD HIGH, BOTH LOW, or FWD LOW
* range C to W sets temperature from 4°C to 29°C
MAN (spring loaded to 6 o’clock position) -
* forward lower lobe cargo trim air valve controlled manually when Lower Lobe Cargo Conditioned Air Flow Rate selector in FWD HIGH, BOTH LOW, or FWD LOW
* resets forward lower lobe cargo conditioned air supply duct shutoff valve if valve closed by duct overheat
C (cool) - valve moves toward closed to provide cooler air.
W (warm) - valve moves toward open to provide warmer air.
AFT LOWER LOBE Temperature (TEMP) Selector
AUTO -
* provides automatic control of aft lower lobe cargo conditioned air temperature when Lower Lobe Cargo Conditioned Air Flow Rate selector in AFT HIGH, BOTH LOW, or AFT LOW
* range C to W sets temperature from 4°C to29°C
MAN (spring loaded to 6 o’clock position) -
* aft lower lobe cargo trim air valve controlled manually when Lower Lobe Cargo Conditioned Air Flow Rate selector in AFT HIGH, BOTH LOW, or AFT LOW
* resets aft lower lobe cargo conditioned air supply duct shutoff valve if valve closed by duct overheat
C (cool) - valve moves toward closed to provide cooler air.
W (warm) - valve moves toward open to provide warmer air.
TRIM AIR Switch
ON -
* automatic and manual selection of pack controller A or controller B enabled
* master trim air valve open and flight deck, upper deck, (400F - crew rest), and main deck zone trim air valves operate automatically
Off -
* master trim air valve closed
* pack output temperature in backup mode regulated to provide average flight deck temperature from 18°C to 29°C as selected by Flight Deck Temperature selector in AUTO
* cabin temperature panel control of (400F - crew rest) and upper deck zone temperatures inhibited
pack controller A selected and both automatic and manual selection of pack controller B inhibited
** if pack controller A failed, pack controller B selected automatically
Equipment (EQUIP) COOLING Selector
STBY -
* ground exhaust valve closed
* automatic control bypassed to configure system for flight; inboard exhaust valve open
* with a single internal fault, equipment inboard exhaust valve closes and cooling system reconfigures to allow internal closed loop recirculation of cooling air
NORM -
* ground operation based on ambient temperature, position of Lower Lobe Cargo Conditioned Air Flow Rate selector, and temperature selected by the Forward Lower Lobe Cargo Temperature selector; equipment cooling air exhausted overboard, or exhausted into forward cargo compartment
* with two or more engines running, Lower Lobe Cargo Conditioned Air Flow Rate selector in OFF, AFT LOW, or AFT HIGH; cooling air exhausted into forward cargo compartment and ground exhaust valve closed
* with two or more engines running, Lower Lobe Cargo Conditioned Air Flow Rate selector in FWD LOW, BOTH LOW, or FWD HIGH and forward lower lobe cargo temperature selected less than 10°C, inboard exhaust valve closed and equipment cooling air recirculated in a closed loop mode
* with a single internal fault, equipment inboard exhaust valve closes and cooling system reconfigures to allow internal closed loop recirculation of cooling air
OVRD -
* inboard exhaust valve closed
* ground exhaust valve closed
* equipment supply valve closed; cooling air supplied through flight
panels
* smoke/override valve open; differential pressure exhausts cooling air overboard
Pack High (HI) FLOW Switch
ON -
*Pack High (HI) FLOW Switch
all operating packs configured to high flow
*EICAS memo message PACKS HIGH FLOW displays
Off (Lower Lobe Cargo Conditioned Air Flow Rate selector in HIGH or BOTH LOW) - no effect on pack flow rates. All packs remain in high flow.
Off (Lower Lobe Cargo Conditioned Air Flow Rate selector in FWD LOW) - packs one and two controlled automatically. Pack three remains in high flow.
Off (Lower Lobe Cargo Conditioned Air Flow Rate selector in AFT LOW) - packs one and three controlled automatically. Pack two remains in high flow.
Off (Lower Lobe Cargo Conditioned Air Flow Rate selector in OFF) - pack air flow controlled automatically.
AFT CARGO Heat (HT) Switch
ON -
* overheat shutoff valve opens to provide bleed air heat to aft and bulk cargo compartments
*temperature control valve closes and opens to maintain temperature
*overheat shutoff valve closes and opens for overheat protection
Off - shuts off aft cargo heat bleed air to compartment.
Aft Cargo Temperature (TEMP) Light
Illuminated (amber) -
* compartment temperature excessive
* overheat shutoff valve closes
PACK Reset (RST) Switch
Push
* resets pack fault protection system
* restarts pack after automatic shutdown if fault no longer exists
Pack System (SYS) FAULT Light
Illuminated (amber) -
* pack overheat or other system fault has occurred
400F
* may illuminate briefly when automatically or manually switching from pack temperature controller A to B or B to A
PACKS Control Selectors
OFF -
* pack valve closed
* extinguishes Pack System Fault light for pack selected off
* resets pack fault protection system
Normal (NORM) -
* pack controller A or B selected automatically on alternate flights
* selected controller is primary controller; selects secondary controller if
primary controller fails
A - selects pack controller A as primary controller; selects B if A fails.
B - selects pack controller B as primary controller; selects A if B fails.
LOWER LOBE CARGO Conditioned (COND) AIR FLOW RATE Selector
OFF -
* forward and aft lower lobe cargo air conditioning off
* resets lower lobe cargo conditioned air supply duct shutoff valves if
valves closed by duct overheat
FWD LOW - two-thirds of pack three conditioned air distributed to forward lower lobe cargo compartment.
AFT LOW - two-thirds of pack two conditioned air distributed to aft lower lobe cargo compartment.
BOTH LOW - two-thirds of pack three and pack two conditioned air distributed respectively to forward and aft lower lobe cargo compartments.
FWD HIGH - all pack three conditioned air distributed to forward lower lobe cargo compartment.
AFT HIGH - all pack two conditioned air distributed to aft lower lobe cargo compartment.
