Perte alimentation ACARS — distinguer 115V AC (Voice Mode) du clue Hot Battery Bus (Clock UTC).ACARS power loss — distinguish 115V AC (Voice Mode) from Hot Battery Bus clue (Clock UTC).
ObjectifObjective
Savoir ce qui reste en Voice Mode, ce qui tombe (Data/Printer), et quand suspecter le Hot Battery Bus.Know what remains in Voice Mode, what drops (Data/Printer), and when to suspect Hot Battery Bus.
On GNDIn FLT
115V AC POWER LOSS
ACARS bascule en Voice Mode — la voix radio via le canal ACARS reste possible selon install.ACARS reverts to Voice Mode — voice radio via the ACARS channel may still be possible depending on install.
Data mode devient inopérant — plus d’uplinks/downlinks data, FANS/CPDLC via ACARS data impactés.Data mode becomes inoperative — no data uplinks/downlinks; FANS/CPDLC via ACARS data impacted.
Printer inopérant. Contrôle paper-slew = détail hardware (pas un reset logiciel).Printer inoperative. Paper-slew control = hardware detail (not a software reset).
Cross-link Electrical : vérifier bus AC associés. Normal teaching — pas une procédure QRH inventée.Cross-link Electrical: check associated AC buses. Normal teaching — not an invented QRH procedure.
Deux chemins distincts — AC Voice Mode vs DC Hot Battery clue.Two distinct paths — AC Voice Mode vs DC Hot Battery clue.
DC POWER LOSS CLUE
Si ACARS est out et l’indication heure Clock UTC est aussi inopérante → suspecter Hot Battery Bus dé-énergisé.If ACARS is out andClock UTC time indication is also inoperative → suspect Hot Battery Bus de-energized.
Watch item NG — croiser avec panneau Electrical / Battery.NG watch item — cross-check Electrical / Battery panel.
CMU · HARDWARE
CMU = Communications Management Unit — routeur data avionique pour FANS, CPDLC et ACARS.CMU = Communications Management Unit — avionics data router for FANS, CPDLC and ACARS.
As installed B737 : Honeywell CMU Mark II / II+ / III ; Rockwell Collins CMU 900.B737 as installed: Honeywell CMU Mark II / II+ / III; Rockwell Collins CMU 900.
Voice Mode ≠ panne totale — Data/Printer seulement INOP sur perte 115V AC.Voice Mode ≠ total failure — only Data/Printer INOP on 115V AC loss.
Toujours croiser Clock UTC avant de conclure Hot Battery Bus.Always cross-check Clock UTC before concluding Hot Battery Bus.
CMU marques = as installed — ne pas inventer un modèle hors liste Honeywell/Collins.CMU brands = as installed — do not invent a model outside Honeywell/Collins list.
VHF-3 reste souvent la voie DATA même en Voice Mode teaching — confirmer sur RTP (LIVE Radio).VHF-3 often remains the DATA path even in Voice Mode teaching — confirm on RTP (LIVE Radio).
Normal ≠ QRH. FCOM Sec.5 · Electrical Hot Battery Bus. Papier fait foi.Normal ≠ QRH. FCOM Sec.5 · Electrical Hot Battery Bus. Paper prevails.