The Door/Oxygen (DOOR/OXY) System Display (SD) page on the Airbus A320’s ECAM shows door statuses, slide arming, crew oxygen pressure, and cabin vertical speed. It’s essential during preflight, taxi, emergency procedures, or unusual cabin events.
1. Door Status Indicators
Cabin, Avionic & Emergency Doors
- Green outline – closed
- Amber – open
- Amber “X” – no status from SDAC
Cargo Doors
- Closed (locked/safe): green
- Open or fault: amber
- No signal or sensor fault: amber “X” (via LGCIU)
Bulk Cargo Door
- Mirrors cabin doors logic
- “BULK” text illuminated in amber if open or white if status missing
Door Names
- Displayed in amber if open
- Displayed in white if no data
- Hidden when closed
2. Slide Arming
- “SLIDE” in white when armed
- Amber dashes if disarmed and door open
- Amber “XX” when no SDAC signal
- No indication when both closed and disarmed
3. Crew Oxygen System
CKPT OXY
- Normally white
- Turns amber if oxygen low-pressure is detected or pushbutton is OFF, with conditions of pressure thresholds, low-pressure signals, or OFF switch status
Oxygen Pressure Value
- Green when ≥ flashing threshold
- Flashing green when just below threshold
- Amber when below amber limit
- “XX” in amber when no signal
Half‑Box Indicator
- Amber half‑box in flight phases when pressure low and FWC conditions unmet
REGUL LO PR
- Normally hidden
- Amber appears for low‑pressure in the crew regulator circuit (<50 psi)
4. Cabin Vertical Speed (V/S)
- Displayed in cruise/climb/descent (phases 5‑7) only
- Green value; pulses if >1,800 ft/min; ceases when below 1,600 ft/min
- Amber “XX” if no SDAC data
- Cyan “FT/MN” unit
- Green arrow shows direction: up for +25 to +1,800; down for −25 to −1,800; pulses outside that band
Why This Page Matters
- 🔍 Quick preflight check – ensures all doors are closed, slides armed, and oxygen pressure adequate
- 🛑 Fault detection – immediately flags missing data (amber X’s) or low oxygen during flight
- 📉 Descent awareness – vertical speed helps monitor cabin pressurization and descent profile
Example ECAM Table
| Section | Closed | Open | No Data/Fault |
|---|---|---|---|
| Cabin Doors | Green | Amber | Amber X |
| Cargo Doors | Green | Amber | Amber X |
| Slide | White “SLIDE” | Amber dashes | Amber “XX” |
| CKPT OXY | White | Amber | Amber “XX” |
| Regulator Low Pr | – | Amber | – |
| V/S | Green arrow | Pulsing arrow if >1,800 | Amber XX |
Frequently Asked Questions
What does an amber “X” mean on the A320 DOOR/OXY ECAM page?
An amber “X” indicates that the aircraft systems cannot receive door status information. For cabin, avionic, and emergency exits, this typically means the System Data Acquisition Concentrator (SDAC) has failed or is not transmitting data. For cargo doors, it may point to a fault with the LGCIU (Landing Gear Control and Interface Unit) or associated sensors.
When does the “SLIDE” indication appear on the ECAM?
The “SLIDE” label appears in white when the escape slide is armed and the door is closed. If the door is open and the slide is disarmed, it shows amber dashes. If slide status cannot be determined due to a system fault, an amber "XX" is displayed.
What triggers the amber “CKPT OXY” warning on the DOOR/OXY page?
The “CKPT OXY” indication turns amber under several conditions:
- The oxygen low-pressure signal is valid and indicates a low level.
- The OXYGEN CREW SUPPLY pushbutton is OFF.
- The system detects low pressure (< amber threshold).
- For dual-bottle systems, if both bottles fall below the defined minimum.
Why is the cabin vertical speed (V/S) not always displayed?
The cabin vertical speed is shown only during flight phases 5, 6, and 7 (climb, cruise, and descent). It is hidden when the aircraft is on the ground. If the vertical speed exceeds ±1,800 feet per minute, the green arrow pulses; if below ±25 ft/min, no arrow is shown. If the data source fails, an amber “XX” replaces the value.