BoredAviator
← MEL

Cabin Differential Pressure Indicator

MEL 21-14
⚠ RAPPEL HOT — RESTRICTION MEL
VOL NON PRESSURISÉ · PAX MAX 10 000 FT
Modes auto/manuel INOP — limit altitude 10 000 ft pax.
Qu’est-ce que c’est
Item MEL « Cabin Differential Pressure Indicator » (ATA 21-14) du système conditionnement d’air / pressurisation sur Boeing 737-800 NG (flotte Air Inuit). Cette page est une aide équipage. Le MEL officiel AILO-0903 fait toujours foi pour le dispatch.
Item MEL
ATA 21-14 — Cabin Differential Pressure Indicator.
Catégorie(s) : C.
Rappel délais : C — 10 jours calendaires.

Source PDF · AILO-0903 Amdt 5 · 2026-01-08. Colonnes : CAT · 2. NUMBER INSTALLED · 3. NUMBER REQUIRED FOR DISPATCH · 4. REMARKS OR EXCEPTIONS. En-tête item : Amdt 5 · 2026-01-08.

21-14 — Cabin Differential Pressure Indicator
CAT — · installé — · requis dispatch —
21-14-03 — Digital Control System Automatic Modes
CAT C · installé 2 · requis dispatch 1
(M)(O) May be inoperative provided: a) Manual mode operates normally, and b) Inoperative controller is deactivated.
21-14-03-03
CAT C · installé 2 · requis dispatch 0
(M#)(O) May be inoperative for unpressurized flight provided: a) Procedures are established and used to ensure lower forward cargo compartment remains empty, or is verified to contain only empty cargo handling equipment, ballast (ballast may be loaded in ULDs), and/or Fly Away Kits (Engine Covers, Tool Kit and Strap Kit), b) Outflow valve is deactivated in 25% open position or removed, c) Recirculation fans operate normally, and d) Extended overwater flight is prohibited. NOTE: For ballast purposes, use of bags (made of glass fibre or kevlar) of sand or ingots of non-magnetic (such as lead) is acceptable. Continued…
21-14-04 — Digital Control System Manual Mode
CAT — · installé — · requis dispatch —
21-14-04-03 — the Pressurization Mode Selector to MAN and then back to AUTO. If the AUTO FAIL light remains extinguished with the Pressurization Mode Selector in AUTO, the fault has been corrected and the controller is operating normally.
CAT C · installé 1 · requis dispatch 0
(M#) (O) May be inoperative for unpressurized flight provided: a) Procedures are established and used to ensure lower forward cargo compartment and main deck cargo compartment remain empty or are verified to contain only empty cargo handling equipment, ballast (ballast may be loaded in ULDs), and/or Fly Away kits (Engine Covers, Tool Kit and Strap Kit), b) Outflow valve is deactivated in 25% open position or removed, c) Recirculation fan(s) operate normally, and d) Extended overwater flight is prohibited. NOTE: For ballast purposes, use of bags (made of glass fibre or kevlar) of sand or ingots of non-magnetic (such as lead) is acceptable. NOTE: Some DCPCS faults indicated by an AUTO FAIL Light are recoverable. Momentarily re-position
Explication (français)
Dispatch selon le MEL Air Inuit AILO-0903 (texte extrait du PDF dans l’app). Catégorie(s) de réparation : C — 10 jours calendaires. 5 condition(s) de relief extraite(s) du tableau officiel (installé / requis / remarques). Une procédure (M#) maintenance (personnel maintenance obligatoire) s’applique avant dispatch — voir ci-dessous. Les switch names, notes et chiffres ci-dessous sont ceux du MEL. Ne pas ajouter d’étape qui n’y figure pas.
Procédure équipage — (O) / (M) / placard

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 affected Pressurization Mode Selector position(s).

4. Journey log / other instructions (texte MEL) :

Print the following information in the journey log sheet. • Condition 1 - Automatic Mode Inoperative ONE AUTOMATIC CABIN PRESSURE CONTROL SYSTEM MODE INOP - USE ALTN MODE • Condition 2 - Automatic Pressurization System Modes Inoperative CABIN PRESSURIZATION SYSTEM INOP. DO NOT PRESSURIZE. • Condition 3 – Pressurization Control Manual Mode Inoperative CABIN PRESSURIZATION SYSTEM INOP. DO NOT PRESSURIZE. MAINTENANCE (M) 21-14-03 One Automatic Modes Inoperative - Pressurized Flight Permitted: Deactivate the inoperative cabin pressure controller (AMM 21-00-00/901): 1. Open and collar the associated P6-4 panel circuit breaker: PRESSURIZATION CONTROL-AUTO 1 or AUTO 2.

5. Respecter toutes les restrictions du MEL — ne pas en inventer.

(M#) MAINTENANCE PROCEDURES — personnel maintenance obligatoire — texte MEL :

21-14-03-03 Automatic Modes Inoperative - Unpressurized Flight: 1. Configure airplane for unpressurized flight (AMM 21-00-00/901): a) Manually position the outflow valve in the 25% open position: i) Position the Pressurization Mode selector to MAN. ii) Hold the VALVE toggle switch in the OPEN or CLOSE position until valve position indicator indicates 25% open. iii) Open and collar these P6-4 panel circuit breakers: a) A/C OVERBOARD EXH VALVE RECONFIG CONT. b) PRESSURIZATION CONTROL AUTO 1 c) PRESSURIZATION CONTROL AUTO 2 b) If the outflow valve cannot be positioned to the 25% open position: i) Open and collar these P6-4 panel circuit breakers: a) PRESSURIZATION CONTROL MANUAL b) PRESSURIZATION CONTROL AUTO 1 c) PRESSURIZATION CONTROL AUTO 2 d) PRESSURIZATION CONTROL IND e) PRESSURIZATION CONTROL LCD LTG ii) Remove the outflow valve (AMM 21-31-03/401). Stow electrical connectors. iii) Open and collar this P6-4 panel circuit breaker: a) A/C OVERBOARD EXH VALVE RECONFIG CONT. Continued… 21-14-04-03 Manual Mode Inoperative - Unpressurized Flight: Configure airplane for unpressurized flight (AMM 21-00-00/901): 1. Position the outflow valve in the 25% open position: a) Set parking brake. b) Start both engines (AMM 71-00-00/201). c) Run the engines for two minutes to allow them to stabilize. d) Advance thrust levers as necessary to make sure that N1 is greater than 60% and N2 is greater than 89%. e) Monitor the outflow valve position indicator as it goes to the closed position. f) When the outflow valve is in the 25% position, open and collar these P6-4 panel circuit breakers: 1. PRESSURIZATION CONTROL AUTO 1 2. PRESSURIZATION CONTROL AUTO 2 g) Retard thrust levers and shut down both engines. h) Open and collar this P6-4 panel circuit breaker: 1. A/C OVERBOARD EXH VALVE RECONFIG CONT 2. If the outflow valve cannot be positioned to the 25% open position: a) Open and collar these P-6 panel circuit breakers: 1. PRESSURIZATION CONTROL MANUAL 2. PRESSURIZATION CONTROL AUTO 1 3. PRESSURIZATION CONTROL AUTO 2 4. PRESSURIZATION CONTROL IND 5. PRESSURIZATION CONTROL LCD LTG b) Remove the outflow valve (AMM 21-31-03/401). Stow electrical connectors. c) Open and collar this P6-4 panel circuit breaker: 1. A/C OVERBOARD EXH VALVE RECONFIG CONT Continued… OPERATIONS (O) 21-14-03 One Automatic Modes Inoperative - Pressurized Flight Permitted: 1. Normal operation of manual mode may be confirmed as follows: a) Position the Pressurization Mode Selector to MAN. b) Use the VALVE toggle switch to observe that the outflow valve position indicator moves to full open, to full closed and then back to full open. 2. Position the Pressurization Mode Selector to ALTN prior to dispatch. NOTE: Subsequent illumination of the AUTO FAIL light during flight requires positioning the Pressurization Mode Selector to MAN for manual mode operation. 21-14-03-03 Automatic Modes Inoperative - Unpressurized Flight: 1. Limit altitude to 10,000 ft. for passenger flights. 2. Non-passenger flights above 10,000 ft. require flight crew to be on oxygen. 3. Extended overwater flight is prohibited. 4. Use only one pack inflight. 5. When dispatching with one operating pack supplied by engine bleed air on takeoff: a) Determine V1(MCG) based on engine bleed for packs OFF. b) Determine takeoff performance based on packs AUTO. 6. Limit climb and descent rates to 500 FPM to avoid passenger discomfort. 7. During the walk around, flight crew will verify the lower forward cargo compartment is empty or only contains empty cargo handling equipment, ballast (ballast may be loaded in ULDs), and/or Fly Away Kits (Engine Covers, Tool Kit and Strap Kit). 21-14-04-03 Manual Mode Inoperative - Unpressurized Flight: 1. Limit altitude to 10,000 ft. for passenger flights. 2. Non-passenger flights above 10,000 ft. require flight crew to be on oxygen. 3. Extended overwater flight is prohibited. 4. Use only one pack inflight. 5. When dispatching with one operating pack supplied by engine bleed air on takeoff: a) Determine V1(MCG) based on engine bleed for packs OFF. b) Determine takeoff performance based on packs AUTO. 6. Limit climb and descent rates to 500 FPM to avoid passenger discomfort. 7. During the walk around, flight crew will verify the cargo hold is empty or only contains empty cargo handling equipment.
Restrictions / notes (extrait MEL)
• Condition 1 - Automatic Mode Inoperative
ONE AUTOMATIC CABIN PRESSURE CONTROL SYSTEM MODE INOP - USE ALTN MODE
• Condition 2 - Automatic Pressurization System Modes Inoperative
CABIN PRESSURIZATION SYSTEM INOP. DO NOT PRESSURIZE.
• Condition 3 – Pressurization Control Manual Mode Inoperative
MAINTENANCE (M)
21-14-03 One Automatic Modes Inoperative - Pressurized Flight Permitted:
Deactivate the inoperative cabin pressure controller (AMM 21-00-00/901):
1. Open and collar the associated P6-4 panel circuit breaker:
PRESSURIZATION CONTROL-AUTO 1 or AUTO 2.
(M#)(O) May be inoperative for unpressurized flight provided: a) Procedures are established and used to ensure lower forward cargo compartment remains empty, or is verified to contain only empty cargo handling equipment, ballast (ballast may be loaded in ULDs), and/or Fly Away Kits (Engine Covers, Tool Kit and Strap Kit), b) Outflow valve is deactivated in 25% open position or removed, c) Recirculation fans operate normally, and d) Extended overwater flight is prohibited.
(M#) (O) May be inoperative for unpressurized flight provided: a) Procedures are established and used to ensure lower forward cargo compartment and main deck cargo compartment remain empty or are verified to contain only empty cargo handling equipment, ballast (ballast may be loaded in ULDs), and/or Fly Away kits (Engine Covers, Tool Kit and Strap Kit), b) Outflow valve is deactivated in 25% open position or removed, c) Recirculation fan(s) operate normally, and d) Extended overwater flight is prohibited.
QRH / procédures liées dans l’app

Liens vers des pages déjà présentes (QRH). Ce ne sont pas des procédures FCOM inventées. Le QRH officiel fait foi.

QRH section 02 — Air Systems (index)

Aide-mémoire formation. Le MEL Air Inuit officiel (AILO-0903) Amdt 5 (2026-01-08) fait toujours foi pour le dispatch, les (O)/(M) et les restrictions. Cette page ne remplace pas le PDF.

MEL officiel · 21-14 (page 81)