MEL 34-20 Radio Altimeter Systems • BoredAviator

MEL 34-20

⚠ RAPPEL HOT — RESTRICTION MEL

CAT II INTERDIT

Radio altimeter — A/P associé peut être limité.

Qu’est-ce que c’est

Item MEL « Radio Altimeter Systems » (ATA 34-20) du système navigation 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 34-20 — Radio Altimeter Systems.
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.

34-20 — Radio Altimeter Systems

CAT — · installé — · requis dispatch —

34-20-01 — Receiver/Transmitters

CAT — · installé — · requis dispatch —

34-20-01-03

CAT C · installé 2 · requis dispatch 1

(M)(O) May be inoperative deactivated provided: a) Approach minimums or operating procedures do not require its use, b) Associated autopilot is not used for approach and landing, c) Autothrottle is not used for approach and landing, and d) Associated flight director is not used for approach and landing. NOTE 1: CAT II operations prohibited. NOTE 2: If arming LNAV on ground with one radio altimeter inoperative, the flight directors and autopilot should be controlled by the FCC on the same side as the valid radio altimeter (i.e., the first flight director and/or autopilot to be engaged must be receiving valid radio altitude data).

34-20-02 — Indications

CAT — · installé — · requis dispatch —

34-20-02A

CAT C · installé 2 · requis dispatch 2

May be inoperative provided: a) Independent radio altimeters operate normally for both flight crew members, and b) Approach minimums do not require their use.

34-20-02B

CAT C · installé 2 · requis dispatch 0

(M#)(O) May be inoperative provided: Associated receiver/transmitter is verified to operate normally, and Approach minimums or operating procedures do not require its use. NOTE: CAT II operations prohibited.

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. 6 condition(s) de relief extraite(s) du tableau officiel (installé / requis / remarques). Une procédure (O) opérations s’applique — voir ci-dessous (texte MEL anglais). 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 display(s) and, if applicable, placard Captain's forward instrument panel: CAT II OPS PROHIBITED.

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

Print the following information in the journey log sheet. (#1) (#2) (BOTH) RADAR ALTIMETER SYSTEM(S) or INDICATIONS INOP - VERIFY CAT II STATUS

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

(O) OPERATIONS PROCEDURES — texte MEL :

34-20-01-03 One Radio Altimeter Receiver/Transmitter Inop: NOTE 1: CAT II operations prohibited. NOTE 2: For airplanes with -1, -2, or -3 SMYD, an invalid signal from radio altimeter number 1 will result in failure of both stick shakers to self test. 1. Ensure that weather minimums or operating procedures are not dependent upon its use. 2. With a radio altimeter inoperative, do not use the associated autopilot, associated flight director, or autothrottle for approach and landing. NOTE: The FCC engages LNAV when the radio altimeters indicate that airplane is 50ft above ground level (AGL). Dispatching with an inoperative radio altimeter system may generate an erroneous radio height indication of 50 ft AGL and may cause the LNAV FMA to flash when armed on ground. 3. For airplanes with FCC Operational Program Software (OPS) 2212-HNP-03B-05 or later installed, if the remaining radio altimeter fails: NOTE: Rockwell Collins FCC Operational Program Software (OPS) part numbers are considered to be equivalent to Honeywell FCC OPS part number 2212-HNP-03B-05 and later. a) AFDS (both sides) will limit the bank angle to a maximum of 8 degrees in all roll modes. b) Use of the Autopilot/Flight Director System (AFDS) is at the discretion of the flight crew. AFDS may not: 1. Command sufficient bank angle to execute proper departure and/or approach maneuvers. 4. Make enroute course changes within airspace limitations. 5. For airplanes without FCC Operational Program Software (OPS) 2212-HNP-03B-05 or later installed, dispatch with an inoperative radio altimeter: NOTE: Rockwell Collins FCC Operational Program Software (OPS) part numbers are considered to be equivalent to Honeywell FCC OPS part number 2212-HNP-03B-05 and later. a) Results in the same side Autopilot/Flight Director System (AFDS) limiting the bank angle to 8 degrees in LNAV mode. b) The opposite side AFDS (operative radio altimeter) is not affected. c) Failure of the remaining radio altimeter can result in: 2. AFDS (both sides) limiting the bank angle to a maximum of 8 degrees (all roll modes) when flaps are extended, 8 degrees in LNAV with flaps retracted. 3. Use of the Autopilot/Flight Director System (AFDS) is at the discretion of the flight crew. AFDS may not: i) Command sufficient bank angle to execute proper departure and/or approach maneuvers. ii) Make enroute course changes within airspace limitations. 34-20-02B Indications - Associated Receiver/Transmitter Verified To Operate Normally: NOTE: CAT II operations prohibited. Ensure that weather minimums or operating procedures are not dependent upon its use.

(M) MAINTENANCE PROCEDURES — texte MEL (maintenance ; l’équipage vérifie que c’est fait) :

34-20-01-03 One Radio Altimeter Receiver/Transmitter Inop: Do these steps (AMM 34-00-00/901): 1. Open and collar associated P6-1/P18-1 panel Radio Altimeter circuit breaker to deactivate the inoperative radio altimeter. NOTE: With one radio altimeter deactivated, the SPEED BRAKE DO NOT ARM light will illuminate on the ground when speed brake handle is moved from the DOWN detent. 2. For airplanes without FCC Operational Program Software (OPS) 2212-HNP-03B-05 or later installed, re-initialize the Flight Control Computer (FCC) associated with the inoperative radio altimeter by momentarily opening and then closing the applicable P6-2/P18-1 panel FCC circuit breaker. NOTE: Rockwell Collins FCC Operational Program Software (OPS) part numbers are considered to be equivalent to Honeywell FCC OPS part number 2212-HNP-03B-05 and later. 3. For airplanes with PSEU part number 285A1600-5 or earlier, refer to MEL Item 32-17. An invalid radio altimeter signal will generate a dispatchable PSEU fault.

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

34-20-02B Indications: To verify that the associated receiver/transmitter is operating normally, refer to the Airplane Maintenance Manual for troubleshooting and system test procedures (AMM 34-33-00).

Restrictions / notes (extrait MEL)

(#1) (#2) (BOTH) RADAR ALTIMETER SYSTEM(S) or INDICATIONS INOP - VERIFY CAT II STATUS

May be inoperative provided: a) Independent radio altimeters operate normally for both flight crew members, and b) Approach minimums do not require their use.

34-20-01-03 One Radio Altimeter Receiver/Transmitter Inop:

NOTE 1: CAT II operations prohibited.

2. With a radio altimeter inoperative, do not use the associated autopilot, associated flight director,

a) AFDS (both sides) will limit the bank angle to a maximum of 8 degrees in all roll modes.

AFDS may not:

crew. AFDS may not:

NOTE: CAT II operations 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 11 — Flight Management (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 · 34-20 (page 454)