1. Confirmer l’item, la catégorie et le nombre requis dans le MEL officiel (lien PDF).
2. Appliquer les procédures (O) et/ou (M) du MEL avant dispatch — texte officiel ci-dessous.
3. Placard (texte MEL) :
Apply sticker adjacent to Passenger Cabin Temperature Control selector(s) or TRIM AIR Switch(es)
as applicable.
4. Journey log / other instructions (texte MEL) :
Print the following information in the journey log sheet.
• Condition 1 - One (Primary)(Backup) Flight Deck Temperature Control System Inop
ONE FLIGHT DECK TEMPERATURE CONTROL SYSTEM INOP - CHECK BEFORE FLIGHT.
• Condition 2 - One or Both Trim Air Modulating Valve(s) Inoperative
TRIM AIR MODULATING VALVE(S) INOP
MAINTENANCE (M) PROCEDURES
21-21-02-02A Trim Air PRSOV Remains CLOSED
Position the TRIM AIR switch to OFF.
5. Respecter toutes les restrictions du MEL — ne pas en inventer.
(O) OPERATIONS PROCEDURES — texte MEL :
21-21-02-01
For initial dispatch with one flight deck temperature control system inoperative, verify normal
operation of the remaining flight deck temperature control system (Primary or Back-up):
1. Push the left or right system annunciator panel on the glare shield and observe that these lights
illuminate:
a) ZONE TEMP for the CONT CAB Temperature Selector
b) AIR COND
c) MASTER CAUTION.
2. Push the left or right MASTER CAUTION light and observe that these lights extinguish:
a) ZONE TEMP for the CONT CAB Temperature Selector
b) AIR COND
c) MASTER CAUTION.
3. Verify that the flight deck supply duct temperature responds to the Temperature Selector:
a) Position the AIR TEMP source selector to SUPPLY DUCT - CONT CAB.
b) Rotate the CONT CAB Temperature Selector to the full clockwise position (full warm).
c) Observe the Air Temperature indicator and check that the temperature increases.
d) Rotate the CONT CAB Temperature Selector to the full counter clockwise position (full cold).
e) Observe the Air Temperature indicator and check that the temperature decreases.
4. Use normal procedures to operate the temperature selectors.
Continued…
21-21-02-02A Trim Air PRSOV Remains CLOSED
1. Operate with TRIM AIR switch OFF.
2. Use normal procedures to operate the temperature selectors. If a comfortable flight deck
temperature cannot be maintained with the CONT CAB zone temperature selector in the normal
range, position the CONT CAB zone temperature selector to OFF.
21-21-02-02B Trim Air Modulating Valve Deactivated CLOSED
Use normal procedures to operate the temperature selectors. If a comfortable flight deck
temperature cannot be maintained with the CONT CAB zone temperature selector in the normal
range, position the CONT CAB zone temperature selector to OFF.
With the flight deck trim air modulating valve deactivated, the associated CONT CAB ZONE TEMP
light will illuminate during Master Caution recall and will extinguish when Master Caution is reset.
(M#) MAINTENANCE PROCEDURES — personnel maintenance obligatoire — texte MEL :
21-21-02-02B Trim Air Modulating Valve Deactivated CLOSED
Deactivate flight deck trim air modulating valve (locked closed) (AMM 21-00-00/901).
1. Position the CONT CAB Temperature Selector to OFF.
2. Locate the flight deck trim air modulating valve in the left ECS bay.
3. Turn the manual override until the visual position indicator shows the full closed position.
4. Disconnect and stow the electrical connector from the valve.
5. Position the CONT CAB Temperature Selector to the normal temperature range.