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can change selections at any time.
Sometimes a group of two or more open-loop conditional line items are designated
as a mutually exclusive set. When the pilot answers YES to any one of the items
in the exclusive set, all other items are automatically answered NO. However, the
opposite is not true. If all of the items but one are answered NO, the last item is
not automatically answered YES. The pilot must manually select YES to one of
the conditional line items in the exclusive set.
The closed loop conditional line item function is identical to open loop except the
decision is made automatically by using airplane system state sensing. When the
conditional line item is sensed true, it changes color to green and the current line
item box moves to the first incomplete step associated with it. If the condition is
sensed false, the conditional line item and its associated steps are no longer
applicable and change color to cyan. The current line item box skips past the cyan
items.
Inhibit Checklist Line Items
When a single airplane system failure results in the display of multiple EICAS
alert messages (a primary message and one or more consequential messages),
inhibit checklist line items allow unnecessary non-normal checklists
(consequential checklists) to be inhibited from display in the checklist queue.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Electronic Checklist Description
Boeing Proprietary 10.60.5
Consequential EICAS alert messages may be displayed as a result of a primary
failure condition. For example, an AUTO SPEEDBRAKE message is displayed
as a result of a HYD PRESS SYS C condition. Consequential EICAS alert
messages also may result from a non-normal checklist crew action. For example,
a PACK L message is displayed when the crew selects the pack off during
accomplishment of the SMOKE AIR CONDITIONING checklist. Corresponding
consequential checklists are inhibited by inhibit checklist line items in the primary
checklist. The inhibit checklist line item lists the consequential checklists which
are inhibited. The inhibit has the following effects on a consequential checklist:
• checklist icon is removed from corresponding EICAS message
• checklist is removed from checklist queue
• notes are not collected on operational notes page
• deferred items are not collected in normal checklists.
If consequential checklist steps, notes, and information are applicable to the
primary failure condition, then these are included in the primary checklist.
Operational Considerations
Operational considerations provide additional information for checklists. They are
located at the very end of the associated non-normal checklist. Viewing the
information is not required to complete the checklist.
Precautionary Text
Precautionary text is critical information which should be read before completing
certain non-normal checklist actions. Precautionary text is displayed directly
above the asssociated line item.
Timers
Where required, an automatic timer is displayed in the upper right hand corner of
the checklist page. Timers help the flight crew keep track of time delays that are
part of checklists. All timers are countdown timers. Timers can be associated with
open loop, closed loop, or conditional line items.
Timers are activated by completing the step just prior to the line item associated
with the timer. Timers run in the background. This allows the flight crew to leave
the checklist to accomplish other tasks and then return to the checklist. An
accurate countdown time is displayed. Timers initially appear in white. When the
time elapses, the timer displays 00:00 and the color changes to amber. When the
current line item box moves to the next incomplete item, the expired timer is
removed from display.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Electronic Checklist Description
10.60.6 Boeing Proprietary
Checklist Menu Operation
An alternate means of operating the checklist is through the use of menus. The
normal, resets, and non–normal menus can be selected by the keys at the top of the
checklist page, using the cursor control device.
An EXIT MENU key is located in the lower right corner of all menu displays. This
exits the menu page to allow access to the normal and non–normal checklist keys.
Normal Menu
Normal checklists are arranged in the menu in sequence. Selecting the NORMAL
menu key or the checklist display switch results in the display of the next
incomplete normal checklist in sequence.
Non–Normal Menu
Non–normal menu selections are arranged by airplane system. Submenus are used
　
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