Maintenance & fault isolation

Access · Flight deck; external access to outflow valve

Tools & materials · CFDS / MCDU · Ground power

Warning · Keep hands clear of the outflow valve doors during test.

1. 1.Run the CPC BITE from the MCDU via CFDS and check no faults recorded.
2. 2.Select MODE SEL MAN; operate MAN V/S CTL up and down; observe the outflow valve moving on the SD CAB PRESS page and visually.
3. 3.Return MODE SEL to AUTO; confirm the valve moves to its auto position.
4. 4.Inspect the valve doors for damage and seals for wear.

Ref: A320 AMM 21-31-00

Access · Engine fan cowl opened

Tools & materials · IDG servicing kit (pressure fill) · Approved oil (MIL-PRF-23699) · Lint-free cloth

Warning · Fan cowl opening in wind > limit is prohibited — secure the hold-open rods.

1. 1.Engine shut down at least 5 min (IDG oil must settle; hot oil overfills reading).
2. 2.Open the fan cowls and read the IDG sight glass: green band = OK, yellow = overfill, below = service.
3. 3.To service: connect fill hose to the fill valve, overflow hose to the overflow drain; pump oil until it flows out the overflow, then stop.
4. 4.Disconnect, cap, check for leaks, close cowls.

Ref: A320 AMM 24-21-00

Access · Pylon access panels

Tools & materials · Pressure/temperature chart · Thermometer

Warning · Squibs are explosive devices — fit shorting plugs and follow ESD precautions.

1. 1.Read the bottle pressure gauge.
2. 2.Measure ambient temperature and compare with the pressure-temperature chart.
3. 3.Check the discharge indicator disc is intact.
4. 4.Check the squib connectors and safety cap.

Ref: A320 AMM 26-21-00

Access · Under the wing

Tools & materials · Drain tool · Clear container · Water detection paste/capsules

1. 1.After the fuel has settled (min 2 h preferred), open each sump drain valve with the tool.
2. 2.Collect fuel until it runs clear; test with water detection capsules.
3. 3.Close the valve, check it does not leak.
4. 4.Record the result in the technical log.

Ref: A320 AMM 12-13-28

Access · Ground service panel (green/blue/yellow)

Tools & materials · Hand pump with filter · Phosphate-ester fluid

Warning · Wear eye protection; Skydrol damages paint and wiring insulation.

1. 1.Depressurise systems; reservoir must be at normal (not pressurised) status.
2. 2.Read reservoir level against the 'refill' scale corrected for the accumulator pressure.
3. 3.Connect the hand pump to the selected reservoir fill coupling via the selector valve.
4. 4.Pump to the NORMAL FILL line.
5. 5.Disconnect and fit caps.

Ref: AMM 12-12-29

Access · Gear accessible on ground

Tools & materials · Calibrated tyre gauge · Nitrogen cart

Warning · Stand at the side, never in front of the wheel — a failed wheel can explode outward.

1. 1.Check cold tyres only (at least 3 h after flight, or compensate).
2. 2.Compare reading with the placard pressure for the aircraft weight.
3. 3.Inflate with dry nitrogen only.
4. 4.If 5–10 % below: inflate and record; recheck in 24 h. >10 %: remove tyre (and the companion on the same axle if it rolled under-inflated).

Ref: AMM 12-14-32

Access · Visual at wheel

Tools & materials · Torch · Ruler

1. 1.Parking brake ON (pressurises the brake).
2. 2.Measure the exposed length of each wear indicator pin.
3. 3.If the pin is flush with or below the housing face, schedule brake replacement.

Ref: AMM 32-42-27

Access · APU access doors, tail cone

Tools & materials · Approved oil · Gravity fill or pressure fill kit

1. 1.APU shut down at least 5 min (or within limits per AMM).
2. 2.Open the APU access doors and read the sight glass, or use the ECAM APU page low-oil-level indication.
3. 3.Service through the gravity fill port to FULL.
4. 4.Close doors and record.

Ref: A320 AMM 12-13-49

Access · Fan cowl oil service door

Tools & materials · Approved oil (e.g. Mobil Jet Oil II) · Gravity fill can or pressure servicing cart

Warning · Engine oil is toxic; avoid skin contact. Hot oil may spray if the cap is removed too early.

1. 1.Wait 5–60 min after shutdown — oil level reads correctly only in that window.
2. 2.Open the oil service access door; check level on the sight gauge.
3. 3.Remove filler cap slowly (tank may be pressurised).
4. 4.Fill to the FULL mark. Do not overfill.
5. 5.Reinstall cap and check it is locked. Close the door.
6. 6.Record quantity added for oil consumption monitoring.

Ref: AMM 12-13-79