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 the affected pack switch(es).
4. Journey log / other instructions (texte MEL) :
Print the following information in the journey log sheet.
• Condition 1 - One Pack Shutoff Valve Inoperative:
(L) (R) PACK INOP. LIMIT ALTITUDE TO FL 250
• Condition 2 - Two Pack Shutoff Valves Inoperative:
BOTH PACKS INOP. LIMIT ALTITUDE TO 10,000 FT.
• Condition 3 - High Flow Modes / Position Signal Discrete Inoperative:
(L)(R)(BOTH)(APU) HIGH FLOW MODE(S) INOP
or
(L)(R) POSITION INDICATOR SWITCH DISCRETE SIGNAL FAILED (OPEN/CLOSED)
5. Respecter toutes les restrictions du MEL — ne pas en inventer.
(O) OPERATIONS PROCEDURES — texte MEL :
21-02 Deactivated Closed:
1. For a pack airflow shutoff valve deactivated closed, the associated pack is considered inoperative.
The airplane must also be dispatched using MEL item 21-01.
21-02-04A Position Indicator Switch Discrete Signal Failed Open:
1. Normal takeoff, engine BLEED air switches ON:
a) Discrete failed open (pack ON signaled to EEC/FMC):
i) Normal engine bleed on takeoff N1 target displayed.
ii) Airplane performance dispatch is calculated assuming packs ON.
2. No engine bleed takeoff:
a) Discrete failed open (pack ON signaled to EEC/FMC):
i) No engine bleed takeoff N1 target displayed.
ii) Airplane performance dispatch is calculated assuming packs OFF.
3. In-Flight:
a) Discrete failed open (pack ON signaled to EEC/FMC):
i) Normal engine bleed on N1 target displayed.
Continued…
21-02-04B Position Indicator Switch Discrete Signal Failed Closed:
1. Normal takeoff, engine BLEED air switches ON:
a) Discrete failed closed (pack OFF signaled to EEC/FMC)
i) FMC target will be too high, resulting in engine overboost and increased likelihood of EGT
or N2 exceedance.
a) Do not use autothrottle.
b) Manually calculate and set takeoff N1 based on engine bleeds on.
c) Airplane performance dispatch is calculated assuming packs ON.
2. No engine bleed takeoff:
a) Discrete failed closed (pack OFF signaled to EEC/FMC):
i) A no engine bleed takeoff is not allowed.
3. In-Flight:
a) Discrete failed closed (pack OFF signaled to EEC/FMC):
i) FMC target will be too high, resulting in engine overboost and increased likelihood of EGT
or N2 exceedance.
a) Do not use autothrottle.
b) Manually calculate and set N1 based on engine bleeds on.
c) Observe normal engine bleed on for en-route climb and go-around AFM
performance limits.
(M) MAINTENANCE PROCEDURES — texte MEL (maintenance ; l’équipage vérifie que c’est fait) :
None required.
(M#) MAINTENANCE PROCEDURES — personnel maintenance obligatoire — texte MEL :
21-02 Deactivated Closed:
NOTE: For a pack airflow shutoff valve deactivated closed, the associated pack is considered
inoperative. The airplane must also be dispatched using MEL item 21-01.
Deactivate and close the associated flow control and shutoff valve(s) (AMM 21-00-00/901):
1. Remove pressure from the pneumatic system.
2. Gain access to the inoperative flow control and shutoff valve located in the air conditioning bay.
3. For the left flow control and shutoff valve, disconnect, cap and stow the D488 or D15830
electrical connector.
4. For the right flow control and shutoff valve, disconnect, cap and stow the D492 or D15834
electrical connector.
5. If the left flow control and shutoff valve limit switch has failed in the OPEN position:
a) Disconnect the electrical connector D486 or D15832.
b) Insert a jumper between pins 1 and 3.
c) Make sure there is continuity to airplane ground at pin 3.
d) Cap and stow connector D486 or D15832.
6. If the right flow control and shutoff valve limit switch has failed in the OPEN position:
a) Disconnect the electrical connector D490 or D15836.
b) Insert a jumper between pins 1 and 3.
c) Make sure there is continuity to airplane ground at pin 3.
d) Cap and stow connector D490 or D15836.
7. Push in the manual control shaft. If already in, pull out and push back in to verify that the
plunger is in.
8. If both flow control and shutoff valves are inoperative:
a) Manually position the outflow valve in the full open position:
i) Position the Pressurization Mode selector to MAN.
ii) Hold the VALVE toggle switch in the OPEN position until valve position indicator indicates
full open.
b) Open and collar the P6-4 Panel circuit breaker A/C OVERBOARD EXH VALVE RECONFIG CONT.
c) Position one of the PACK switches in HIGH.
d) For passenger cabin telecommunications system installed, open and collar P6-1 Panel circuit
breaker ENTERTAINMENT PASS TEL CTU.
Continued…