BoredAviator
Anti-Ice, Rain
NNC
ConditionCondition
Voyant bleu COWL VALVE OPEN — vanne Engine Anti-Ice en transit ou en désaccord avec la commande (et/ou indication TAI).Blue COWL VALVE OPEN — Engine Anti-Ice valve in transit or disagreeing with command (and/or TAI indication).
ObjectifObjective
Interpréter bright/dim au ralenti et en vol ; éviter dual bleed avant montée N1 ; connaître les pièges dispatch vanne OPEN.Interpret bright/dim at idle and in flight; avoid dual bleed before raising N1; know dispatch traps with valve locked OPEN.
OR
COWL VALVE OPEN
BRIGHT → DIM Transit / disagree → seated · ~30% N1 if idle bright (anti dual-bleed first)
On GND
Bright au idleBright at idleSOV 9e + backpressure APU9th SOV + APU backpressure
~30% N1Après anti dual-bleedAfter anti dual-bleed
MEL 30-03 / 36-09Vanne AI / High Stage inopAI valve / High Stage inop
MEL 30-04Voyant / capteur — pas l’airLight / sensor — not air
Garder le switch Engine Bleed Valve sur OFF pendant le start moteur pour éviter un hot start ! Après cutout starter, une perte massive d’air 5e étage (cowl + système bleed) ralentit l’accélération.Keep the Engine Bleed Valve switch OFF during engine start to avoid a hot start! After starter cutout, massive 5th-stage air loss (cowl + bleed system) slows acceleration.
MEL 30-03 mxSOV 9e fermée · Bleed OFF9th SOV closed · Bleed OFF
N1 max only−1.1% / −1.4%
VNAVOK · A/T ignore limitesOK · A/T ignores limits
Wing A/INormalNormal
Wet · SOPWet · SOP Contaminée · ON (SP 16.x)Contaminated · ON (SP 16.x) Field-limited wet · OFF si < 3 mmField-limited wet · OFF if < 3 mm +70 / +180 kg/h

Six indications Engine AI ONSix Engine AI ON indications

  1. COWL VALVE OPEN bright puis dimCOWL VALVE OPEN bright then dim
  2. Pression duct ↓Duct pressure ↓
  3. N1 ≈ −0,7 % (A/T compense)N1 ≈ −0.7% (A/T compensates)
  4. Autorité max A/T ↓ (bug N1 vert)A/T max authority ↓ (green N1 bug)
  5. Fuel flow ↑Fuel flow ↑
  6. EGT ↑EGT ↑

Perte DC Bus → vannes spring-loaded fermées.DC Bus loss → valves spring-loaded closed.