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Chapter 14
Ice and rain protection

 14.1 Double AOA heat fail
 14.2 Multiple pitot heat failures
 14.3 Single pitot probe heat or static port heat fault
 14.4 Single AOA or TAT heat fault
 14.5 Probe heat computer failure
 14.6 Window heat fault
 14.7 Engine anti-ice valve fault
 14.8 Wing anti-ice valve faults

14.1 Double AOA heat fail

If two aoa probes are affected by icing, the computers may erroneously deselect the remaining good adr. Switching off one of the affected adrs leaves the system in the state described in Section 11.6.

[ qrh aep.a-ice, fcom pro.aep.a-ice ]

14.2 Multiple pitot heat failures

The issue with loss of anti-ice on more than one pitot probe is that it is possible that the two unprotected pitot probes will ice up at the same time and provide erroneous but coherent data. This leads to a situation where the adr associated with the remaining protected probe is locked out despite being the single correct source.

Obviously, the first thing to do is to avoid icing conditions.

If there is a working adr connected to a protected probe, turn one of the adrs associated with an unprotected probe off. This ensures that an adr disagree ecam caution is triggered by significant speed discrepancies and ensures that the protected adr will not be automatically deselected.

If pitot heat is lost on all probes, one of the adrs should, again, be turned off to ensure the adr disagree ecam caution is provided. If icing is expected, turn off a second adr and be ready to apply unreliable airspeed procedures (see Section 2.3).

[ anti ice all(capt(f/o)+f/o(stby)) pitot, fcom pro.aep.a-ice ]

14.3 Single pitot probe heat or static port heat fault

The adr associated with the failed probe or port should be considered unreliable. adr1 or adr2 can be replaced with adr3 using air data switching. If using standby instruments with adr3 unreliable, air data information must be monitored closely.

[ anti ice capt(f/o)(stby) pitot(l(r) stat), fcom pro.aep.a-ice ]

14.4 Single AOA or TAT heat fault

No immediate operational effect.

[ anti ice capt(f/o)(stby) aoa(tat), fcom pro.aep.a-ice ]

14.5 Probe heat computer failure

If applicable, deselect the affected ADR.

[ anti ice capt(f/o)(stby) probes, fcom pro.aep.a-ice ]

14.6 Window heat fault

No immediate operational effect.

[ anti ice l(r)(l+r) windshield(window), fcom pro.aep.a-ice ]

14.7 Engine anti-ice valve fault

If a valve fails to open when commanded, avoid icing conditions. If it fails to close when commanded, a thrust limit penalty applies.

[ anti ice eng 1(2) valve open(clsd), fcom pro.aep.a-ice ]

14.8 Wing anti-ice valve faults

If a wing anti-ice valve is open when commanded closed:

If a wing anti-ice valve is closed when commanded open, the wing anti-ice must be turned off to avoid asymmetrically de-icing the wings. Avoid icing conditions. If ice accretion does occur, landing distances and VAPP adjustments are in qrh and speed must be maintained above the higher of VLS + 10kt or Green Dot.

[ wing anti ice sys fault, fcom pro.aep.a-ice, fcom pro.nor.sup.aw ]