Lights

Question 1

A/P Disengage Light (red)

Flashes and Tone sounds

Answer 1

AP disengaged

EHH/EHI/EHH
• autopilot engage attempt made and is unseccessful
• reset by push either light or disengage switch

Question 2

A/P Disengage Light (red)

Steady

Answer 2

• stabilizer out of trim below 800 feet RA on dual channel approach
• ALT ACQ mode inhibited during AP go around if stabilizer not trimmed for single AP Operatiin
• disengage light held in 2
• automatic ground system test fails

Question 3

A/P Disengage Light (amber)

Steady

Answer 3

Disengage light test held in 1

Question 4

A/P Disengage Light (amber)

Flashes

Answer 4

AP automatically revert to CWS pitch or roll while in CMD. Reset by pushing either light or select another mode

Question 5

Auto throttle (AT) disengage light (red) flashing

Answer 5

Auto throttle has disengaged

Question 6

Auto throttle (AT) disengage light (red) steady

Answer 6

Disengage light test held in 2

Question 7

Auto throttle (AT) disengage light (amber) flashing

Answer 7

• A/T airspeed error under following conditions:
  
  • inflight
  • flaps not up
  • airspeed differs from commanded value by +10 or -5 knots and is not approaching commanded value

Question 8

Stabilizer out of trim light

Answer 8

Operates only with autopilot engaged. Remains extinguished when AP off

Autopilot not trimming stabilizer properly

Question 9

A/T LIM on thrust Mode display

Answer 9

Illuminated white- the FMC is not providing the A/T system with N1 Limit values.
The A/T using degraded N1 thrust limit from the related EEC