[78反推] 天天都在用反推，但你真的会用吗？

Both REVERSER (737-600/-700/-800/-900) or REVERSER LIMITED (737-7/-8/-9/-10) lights along with the two MASTER CAUTION lights and the amber ENG light on the system annunciator panel can illuminate after the reverse thrust levers are stowed. These indications can occur if the reverse thrust levers are held below reverse idle detent (detent No. 1), but above the stowed position, for several seconds. If the reverser sleeves fail to stow and forward thrust is commanded, engine thrust increase is inhibited.

These events occur when the reverse thrust levers are positioned far enough towards the stow position to initiate a timer for reverser stow fault monitoring and a timer for electro-mechanical lock operation, but not far enough to initiate the stow command. The reverse thrust lever position to initiate these timers occurs at about two knob widths below the reverse idle detent toward the stowed position. The stow command occurs at approximately four knob widths below the reverse idle detent.

On the 737-600/-700/-800/-900, the REVERSER lights illuminate if the reverse thrust levers are held between these two positions for more than approximately 8 seconds. The electro-mechanical locks operate and the reverser sleeves remain deployed if the reverse thrust levers are held between these two positions for more than approximately 16 seconds even when the reverse thrust levers are moved to the stowed position. Forward thrust is limited to idle if the reverser fails to stow. The ENGINE CONTROL lights illuminate if forward thrust is commanded after the reverser fails to stow.

On the 737-7/-8/-9/-10, the REVERSER LIMITED lights illuminate, the electro-mechanical locks operate and the reverser sleeves remain deployed if the reverse thrust levers are held between these two positions for more than approximately 8 seconds even when reverse thrust levers are moved to the stowed position. Forward thrust is limited to idle if the reverser fails to stow. The MAINT light illuminates 30 seconds after landing.

Cycling the thrust reverser to deploy and stow again clears the REVERSER or REVERSER LIMITED lights, resets the system and stows the reversers. The ENGINE CONTROL lights, if illuminated, need maintenance action. On the 737-7/-8/-9/-10, the MAINT light needs maintenance action.

The following note has been added to the thrust reverser system description in the Flight Crew Operations Manual (FCOM) to clarify the effects of reverse thrust lever movement:

737-600/-700/-800/-900

Note:A pause in movement of the reverse thrust levers past detent No. 1 toward the stow position can cause MASTER CAUTION and ENG system annunciator lights to illuminate. A pause of approximately 16 seconds engages the electro-mechanical lock and prevents the thrust reverser sleeves from further movement. Cycling the thrust reversers can clear the fault and restore normal operation.

737-7/-8/-9/-10

Note:A pause in movement of the reverse thrust levers past detent No. 1 toward the stow position can cause MASTER CAUTION and ENG system annunciator lights to illuminate. A pause of approximately 8 seconds engages the electro-mechanical lock and prevents the thrust reverser sleeves from further movement. Cycling the thrust reversers can clear the fault and restore normal operation. The MAINT light illuminates 30 seconds after landing.

Flight crews are reminded of the following steps in the 737 FCOM, Landing Roll Procedure along with comments:

"By 60 knots, start movement of the reverse thrust levers to be at the reverse idle detent before taxi speed."

Comment:Whenever commanding idle reverse thrust, ensure that the reverse thrust levers are positioned to reverse idle detent and not below.

"After the engines are at reverse idle, move the reverse thrust levers full down."

Comment:Move the reverse thrust levers slowly, but without pause.