Automatic flight

Question 1

When you press the (L NAV) Switch

Answer 1

• LNAV engages if the airplane is above 50’ RA and
• within 2.5 NM of the active leg
• if not within 2.5 NM of the active leg and on an intercept heading to the active leg, remains armed then engages when approaching the active leg

Question 2

When will LNAV deactivate?

Answer 2

• (HDG HOLD) or heading select (HDG SEL)
• when localizer is captured
• if there is a dual FMC failure
• by pushing L NAV switch a second time when LNAV is armed

Question 3

VNAV deactivates when…

Answer 3

• selecting GA, FL CH, SPD or THR, V/S or ALT HOLD
• pushing VNAV switch a second time when VNAV is armed
• in climb or descent, reaching altitude displayed in altitude window prior to reaching FMCs target altitude
• passing top of descent point if the MCP is not set to an altitude below cruise altitude
• when glideslope is captured

Question 4

What happens concerning thrust when Flight Level Change (FL CH) Switch is pressed?

Answer 4

Changes thrust reference from TO to CLB if above 400 feet radio altitude.

Question 5

When you press the LOC switch, explain capture?

Answer 5

Localize capture can occur when intercept track angle is within 120 degrees of the localizer course.

Note: After localizer capture, flight director roll commands may appear inconsistent with A/P roll maneuvers for one to two minutes.

Question 6

Describe the Autoland Status Annunciator?

Upper window

Answer 6

LAND 3 – (green)

LAND 2 – (green)

Question 7

What is LAND 3 ?

Answer 7

LAND 3 – (green)

• indicates all three autopilot systems with their airplane system inputs are operating normally
• appears below 1500 feet radio altitude with LOC and G/S captured

Question 8

What is LAND 2 ?

Answer 8

LAND 2 – (green)

• indicates a minimum of two autopilot systems with their airplane system inputs are operating normally.
• appears below 1500 feet radio altitude with LOC and G/S captured

Question 9

Describe the Autoland Status Annunciator?

Lower window

Answer 9

NO AUTOLND (amber)

NO LAND 3 (amber)

Question 10

What is NO AUTOLND?

Answer 10

NO AUTOLND (amber) – indicates fault conditions exist which preclude the use of the autopilots for an automatic landing.

Question 11

What is NO LAND 3?

Answer 11

NO LAND 3 (amber) – indicates a fault condition exists which results in a LAND 2 condition.

Question 12

Pushing either GO AROUND Switches does what?

Answer 12

• engages AFDS and autothrottle in GA mode if previously armed
• provides windshear guidance during GA mode if previously armed
• if flight director off, activates flight director in GA mode
• cancels all thrust derates if selected after takeoff

Question 13

When does the Go around Arm?

Answer 13

• automatic arming occurs at glide slope capture or extension of wing flaps

Question 14

Autopilot (AUTO PILOT) Light

Illuminated (amber) –

Answer 14

• a degraded operating condition exists in engaged autopilot
• extinguished when condition is corrected or
• an alternate autopilot is selected, provided fault is not common to alternate autopilot

Question 15

Describe the

AUTOMATIC FLIGHT CONTROL SYSTEM

Answer 15

The automatic flight control system consists of the

             autopilot flight director system _(AFDS)_

                              autothrottle system _(A/T)._

The mode control panel (MCP) and flight management

computer (FMC) control the AFDS and the autothrottle

system to perform climb, cruise, descent and approach.

Question 16

The Autopilot Flight Director System
The AFDS consists of______flight control computers (FCCs) and the_______?

Answer 16

The AFDS consists of three flight control computers (FCCs) and the MCP.

Question 17

Describe the Autopilot Flight Director System

Answer 17

The three FCCs, left, center, and right, control separate hydraulically powered autopilot control servos to operate flight controls.

The autopilot controls ailerons and elevators.

Rudder commands are added only during a multiple autopilot approach.

Nose wheel steering is also added during rollout from an automatic landing.

During an ILS approach with all three autopilots engaged, separate electrical sources power the three FCCs.

Question 18

What are the indications of a flight director failure?

Answer 18

A flight director failure in either pitch or roll, causes the respective steering bars to disappear

Question 19

What conditions cause the FD display to occurr

Answer 19

The steering indications are displayed when

the related flight director switch is OFF and

a go–around switch is pushed,

if airspeed is greater than 80 knots and
the flaps are not retracted.