MEL 32-21
Qu’est-ce que c’est
Item MEL « Flap Landing Warning Switch, S138 » (ATA 32-21) du système train d’atterrissage 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 32-21 — Flap Landing Warning Switch, S138.
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 Original · 2024-05-31.
32-21 — Flap Landing Warning Switch, S138
CAT — · installé — · requis dispatch —
32-21 — Flap Landing Warning Switch, S138
CAT C · installé 1 · requis dispatch 0
(M#) Switch contacts normally in use may be inoperative provided: a) S138 switch is rewired using an alternate set of contacts, and b) PSEU BITE is used to verify normal operation of S138 switch.
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. 2 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 Flap Landing Warning Switch.
4. Journey log / other instructions (texte MEL) :
Print the following information in the journey log sheet.
FLAP LANDING WARNING SWITCH INOP
5. Respecter toutes les restrictions du MEL — ne pas en inventer.
(O) OPERATIONS PROCEDURES — texte MEL :
None required.
(M#) MAINTENANCE PROCEDURES — personnel maintenance obligatoire — texte MEL :
S138 switch is rewired and PSEU BITE is used to verify normal operation of the S138 switch (AMM
32-00-00/901).
1. Failure of the S138 switch is indicated by illumination of the PSEU fault light accompanied by fault
message numbers 32-62009, 32-62010 or 32-62014 shown in the PSEU BITE.
2. Each fault message indicates a high resistance short to ground or disagreement between contacts
as shown below:
a) 32-62009/32-62109 D10984 pin 48 S138 contact “3” wire W8124-A-CC
b) 32-62010/32-62110 D10984 pin 49 S138 contact “18” wire W8124-A-UU
c) 32-62014 Disagreement between contacts “3” and “18”
For a S138 switch with connector attached to D14730:
a) 32-62009 /32-62109 D10984 pin 48 S138 contact “C” wire W8124-0506-20
b) 32-62010 /32-62110 D10984 pin 49 S138 contact “U” wire W8124-0511-20
c) 32-62014 Disagreement between contacts “C” and “U”
Continued…
3. Refer to Wiring Diagram Manual 32-64-21 and wire list for available contacts. The wires for the
contact set (center tap contact and normally open contact) may be cut from the S138 switch set
and connected to an available set of contacts in the same switch as follows, until the switch can
be replaced:
a) Select flaps full up
b) Select an available set of contacts, after verifying that the normally open contact exhibits
better than 10.0 mega-ohms isolation resistance to ground and to center tap.
c) Connect wire to selected set of contacts using approved waterproof splices per Standard
Wiring Practices Manual
d) Cap and stow deactivated wires from S138 switch.
e) Test the S138 switch as follows:
1. Use the PSEU BITE panel to select the S138 switch through D10984 pin 48 and 49 and
verify each position displays NO GND.
2. Select flaps 15
3. Use the PSEU BITE panel to select the S138 switch through D10984 pin 48 and 49 and
verify each position displays GND.
4. Alternate to step 3. For a S138 switch with connector attached to D14730. Refer to Wiring
Diagram Manual 32-64-21 and wire list for available contacts. Refer to Standard Wiring Practices
Manual for any established wiring procedures required. Remove the connector pins A and C, or U
and S, from whichever is discrepant on the switch side.
a) Select flaps full up.
b) Select an available set of contacts, after verifying that the normally open contact exhibits
better than 10.0 mega-ohms isolation resistance to ground and to center tap. Available set
may be any of the switch NO and CT contacts on any available switch (i.e.: D and F, K and M,
N and R).
c) Insert the connector pins removed from A and C, or U and S, into whichever set of connector
pin locations previously selected above.
d) Plug connector holes with removed plugs from pins at newly used set of contacts.
e) Test the S138 switch as follows:
1. Use the PSEU BITE panel to select the S138 switch through D10984 pin 48 and 49 and
verify each position displays NO GND.
2. Select flaps 15.
3. Use the PSEU BITE panel to select the S138 switch through D10984 pin 48 and 49 and
verify each position displays GND.
None required.
Restrictions / notes (extrait MEL)
FLAP LANDING WARNING SWITCH INOP
QRH / procédures liées dans l’app
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 · 32-21 (page 401)