Caution And Warning Systems

Question 1

When is predictive wind shear active?

When is it inhibited in those regime(s)

Answer 1

Takeoff and approach

Cautions inhibited between 80 knots and 400’ RA
Warnings inhibited between 100 knots and 50’RA

Question 2

How can predictive wind shear be activated prior to take off?

Is there an automatic method?

Is there a delay?

Answer 2

• Select WXR on the EFIS selector
• Automatically engages when Thrust Lever Angle is over 53 degrees
• 12 seconds

Question 3

Will predictive windshear work in clear air?

Answer 3

No. Requires particulate / water to work

Question 4

What is the predictive wind shear envelope?

Answer 4

3 miles, 30 degrees off course

Question 5

The green dot is called

Answer 5

Range to target

Question 6

What is the purpose of the Proximity Switch Electronic Unit (PSEU)?

Answer 6

The PSEU provides the following functions:

• Air/ground sensing
• Landing gear position indication and warning
• Landing gear transfer valve control
• SPEEDBRAKES EXTENDED light control
• Takeoff warning horn and TAKEOFF CONFIG light control
• Door Warning System
• Flight Control indication (e.g., flap/slat position)
• Stall management yaw damper inputs
• Tail skid control

Question 7

When does the MASTER CAUTION light illuminate?

Answer 7

When a caution occurs outside the normal field of vision of the Flight Crew.

Question 8

What color lights require immediate attention of the Flight Crew?

Answer 8

Red Warning Lights

Bonus:
Indicate:
• engine, wheel well, cargo, or APU fires
• autopilot and autothrottle disengages
• landing gear in unsafe conditions

Question 9

What color lights require timely attention of the Flight Crew?

Answer 9

Amber Caution Lights indicate conditions which require the timely attention of the Flight Crew.

Question 10

How do Master Caution System alerts differ between single/simple and dual-channel faults?

Answer 10

A single fault in certain redundant systems, also known as a “simple fault,” does not illuminate the MASTER CAUTION lights. However, this type of fault is stored in the Master Caution System & Pushing the system annunciator recalls the simple fault on the System Annunciator panel.

Dual-channel faults illuminate the Master Caution and associated system that is faulting.

Question 11

What is the lowest elevation, relative to the aircraft, that red indicates on the terrain display?

Answer 11

• Red: terrain elevation is more than 2000 ft above the aircraft altitude (displays based on calculated time to impact, so not everything is displayed that could be present.)

Question 12

The FLAP INHIBIT switch is used to inhibit which GPWS callout(s)?

Answer 12

• FLAP INHIBIT: prevents TOO LOW FLAPS aural alert, regardless of flap position

Question 13

When is the “500” RA callout provided?

Answer 13

Descending below 500 ft radio altitude on approach

IF:
• an approach other then ILS or GLS is used, or
• a valid localizer frequency is tuned and:
- the flight path is not within ±2 dots of a localizer beam, or
- the flight path is not within ±2 dots of a glideslope beam, or
- a backcourse approach is detected

Question 14

What is the reactive windshear alert provided by the GPWS?

Answer 14

Windshear alerting under the following conditions:
• During takeoff, rotation until reaching 1500 ft AGL
• During approach, from an altitude of 1500 ft AGL to 10 ft AGL
• During a missed approach until an altitude of 1500 ft AGL is reached

Question 15

What does an amber ROLL/YAW ASYMMETRY on the PFD indicate?

Answer 15

Autopilot has reached 75% of its total roll authority:

• the amber alert, ROLL/YAW ASYMMETRY, appears on the PFD and HUD
• the bank pointer and slip/skid indicator become outlined
• the slip/skid indicator becomes solid amber if the slip/skid indicator is deflected greater than 25% of its width

Question 16

How is the radar selected on?

Answer 16

Selecting WXR on the EFIS control panel

Deselecting WXR, or selecting TERR, deactivates the weather radar and removes weather information from the associated ND.

Question 17

What is provided when WX+T is selected on the Radar control panel?

Answer 17

• WX+T: displays weather radar returns and turbulence (manual mode)

or weather radar returns and threats (auto mode); turbulence is displayed out to 40 nm for all selected ranges

Question 18

What type of windshear warning(s) does the weather radar provide?

Answer 18

Predictive windshear WARNING

• a detected windshear event occurs within 0.5 nm diameter path and within ±30° of the aircraft heading.
• The windshear WARNING occurs for windshear events within 3 nm.

The predictive windshear CAUTION

• a detected windshear event occurs within ±30° of the aircraft heading and within 3 nm of the aircraft.

Question 19

Is radar turbulence detection capable of detecting clear air turbulence?

Answer 19

Weather radar provides turbulence alerts only for air containing some level of moisture or particulate matter.

Question 20

How long after activation does the PWS take until cautions or warnings can be provided?

Answer 20

Approximately 12 seconds after the weather radar begins scanning for windshear.

Question 21

How is the Predictive Windshear System (PWS) activated?

Answer 21

The weather radar automatically begins scanning for windshear when:

• thrust levers are set for takeoff, even if respective engine is off or IRS not aligned, or
• in flight below 2300 ft RA (predictive windshear alerts are issued below 1200 ft RA)

Question 22

What is the aural alert for a PWS Caution?

Answer 22

MONITOR RADAR DISPLAY

Question 23

How is the Runway Awareness and Advisory System (RAAS) activated?

Answer 23

RAAS operates without any actions required by the Flight Crew. RAAS requires these conditions for proper operation:

• Terrain/runway are contained in the EGPWS’ terrain database
• The GPS signals are available and meet the minimum accuracy
• The RUNWAY INHIBITD switch is in the NORM position

Question 24

How are Resolution Advisories (RAs) displayed on the PFD?

Answer 24

Red lines on the PFD indicating pitch regions to avoid to resolve the traffic conflict. The aircraft symbol must be outside the TCAS pitch command area to ensure traffic avoidance.

Question 25

What is the indication of a Traffic Advisory (TA)?

Answer 25

An amber dot at the proper range and relative bearing to the other aircraft with the ND mode in expanded MAP, center MAP, expanded APP, or expanded VOR and TFC is selected on the EFIS control panel. TA is generated when the other aircraft is approximately 40 seconds from the point of closest approach. Altitude and vertical motion are included with the TA symbol if the other aircraft is using Transponder Mode S or C. TAs are indicated by the aural “TRAFFIC, TRAFFIC,” which sounds once and is then reset until the next TA occurs.

Question 26

What is the difference between the amber MAINT light on the aft overhead panel and the magenta MAINT box on the MDS SYS page?

Answer 26

The illumination of the MAINT light on the aft overhead panel indicates that a system fault exists that must be reviewed by Maintenance. The magenta MAINT light box on the MDS SYS page is menu item for opening up the Onboard Maintenance System. (MAX, NG has neither)

Question 27

What is the purpose of the Proximity Switch Electronic Unit (PSEU)?

Answer 27

PSEU provides the following functions: • Air/ground sensing for aircraft systems • Landing gear position indication and warning • Landing gear transfer valve control • SPEEDBRAKES EXTENDED light control • Takeoff warning horn and TAKEOFF CONFIG light control • Door Warning System • Flight Control indication (e.g., flap/slat position) • Stall management yaw damper inputs • Tail skidD control

Question 28

When does the MASTER CAUTION light illuminate?

Answer 28

When a caution occurs outside the normal field of vision of the Flight Crew, the respective System Annunciator light(s) and the two MASTER CAUTION lights illuminate. The lights remain illuminated as long as the caution condition exists, or until the Flight Crew resets the system.

Question 29

What color lights require immediate attention of the Flight Crew?

Answer 29

Red Warning Lights. These lights are in the pilots’ primary field of vision and indicate: • engine, wheel well, cargo, or APU fires • autopilot and autothrottle disengages • landing gear in unsafe conditions

Question 30

What color lights require timely attention of the Flight Crew?

Answer 30

Amber Caution Lights indicate conditions which require the timely attention of the Flight Crew.

Question 31

How do Master Caution System alerts differ between single/simple and dual-channel faults?

Answer 31

A single fault in certain redundant systems, also known as a “simple fault,” does not illuminate the System Annunciator and MASTER CAUTION lights. However, this type of fault is stored in the Master Caution System. Pushing the system annunciator recalls the simple fault on the System Annunciator panel. Dual-channel faults illuminate the Master Caution and associated system that is faulting.

Question 32

What is the lowest elevation, relative to the aircraft, that red indicates on the terrain display?

Answer 32

• Red: terrain elevation is more than 2000 ft above the aircraft altitude

Question 33

The FLAP INHIBIT switch is used to inhibit which GPWS callout(s)?

Answer 33

• FLAP INHIBIT: prevents TOO LOW FLAPS aural alert, regardless of flap position

Question 34

When is the “500” RA callout provided?

Answer 34

When descending below 500 ft radio altitude on approach, a FIVE HUNDRED callout is given if: • an approach other then ILS or GLS is used, or • a valid localizer frequency is tuned and: - the flight path is not within ±2 dots of a localizer beam, or - the flight path is not within ±2 dots of a glideslope beam, or - a backcourse approach is detected

Question 35

What is the reactive windshear alert provided by the GPWS?

Answer 35

Windshear alerting is active under the following conditions: • During takeoff, from rotation until reaching 1500 ft AGL • During approach, from 1500 ft AGL to 10 ft AGL • During a missed approach until an altitude of 1500 ft AGL is reached

Question 36

What does an amber ROLL/YAW ASYMMETRY on the PFD indicate?

Answer 36

When the autopilot has reached 75% of its total roll authority: • Amber ROLL/YAW ASYMMETRY, appears on PFD and HUD • Bank pointer and slip/skid indicator become outlined • Sslip/skid indicator becomes solid amber if the slip/skid indicator is deflected greater than 25% of its width

Question 37

How is the radar selected on?

Answer 37

Selecting WXR on the EFIS control panel activates weather radar on the associated ND. Deselecting WXR, or selecting TERR, deactivates the weather radar and removes weather information from the associated ND.

Question 38

What is provided when WX+T is selected on the Radar control panel?

Answer 38

• WX+T: - displays weather radar returns and turbulence (manual mode), or - weather radar returns and threats (auto mode); - turbulence is displayed out to 40 nm for all selected ranges

Question 39

What type of windshear warning(s) does the weather radar provide?

Answer 39

Predictive windshear WARNING is generated whenever a detected windshear event occurs within a 0.5 nm diameter path of the aircraft and within ±30° of the aircraft heading. The windshear WARNING occurs for windshear events within 3 nm. The predictive windshear CAUTION is generated whenever a detected windshear event occurs within ±30° of the aircraft heading and within 3 nm of the aircraft.

Question 40

Is radar turbulence detection capable of detecting clear air turbulence?

Answer 40

The weather radar is not capable of detecting clear air turbulence. The weather radar uses radar imaging to detect disturbed air . The weather radar provides turbulence alerts only for air containing some level of moisture or particulate matter.

Question 41

How long after activation does the PWS take until cautions or warnings can be provided?

Answer 41

Alerts are available approximately 12 seconds after the weather radar begins scanning for windshear. Predictive windshear alerts can be enabled prior to takeoff (manually) by pushing the EFIS control panel WXR switch to activate the radar.

Question 42

How is the Predictive Windshear System (PWS) activated?

Answer 42

The weather radar automatically begins scanning for windshear when: * thrust levers are set for takeoff, even if respective engine is off or IRS not aligned, or * in flight below 2300 ft RA (predictive windshear alerts are issued below 1200 ft RA)

Question 43

What is the aural alert for a PWS Caution?

Answer 43

MONITOR RADAR DISPLAY

Question 44

How is the Runway Awareness and Advisory System (RAAS) activated?

Answer 44

This system provides timely alerts for scenarios that have traditionally led to runway incursions or excursions. RAAS operates without any actions required by the Flight Crew. RAAS requires these conditions for proper operation: • Terrain/runway are contained in the EGPWS’ terrain database • The GPS signals are available and meet the minimum accuracy • The RUNWAY INHIBITD switch is in the NORM position

Question 45

How are Resolution Advisories (RAs) displayed on the PFD?

Answer 45

TCAS pitch commands on the PFD consist of red lines on the PFD indicating pitch regions to avoid in order to resolve the traffic conflict. The aircraft symbol must be outside the TCAS pitch command area to ensure traffic avoidance.

Question 46

What is the indication of a Traffic Advisory (TA)?

Answer 46

The Traffic Advisory (TA) symbol appears as an amber dot at the proper range and relative bearing to the other aircraft with the ND mode in expanded MAP, center MAP, expanded APP, or expanded VOR and TFC is selected on the EFIS control panel. A TA is generated when the other aircraft is approximately 40 seconds from the point of closest approach. Altitude and vertical motion are included with the TA symbol if the other aircraft is using Transponder Mode S or C. TAs are indicated by the aural “TRAFFIC, TRAFFIC,” which sounds once and is then reset until the next TA occurs.

Question 47

What is the difference between the amber MAINT light on the aft overhead panel and the magenta MAINT box on the MDS SYS page?

Answer 47

The illumination of the MAINT light on the aft overhead panel indicates that a system fault exists that must be reviewed by Maintenance. The magenta MAINT light box on the MDS SYS page is purely a menu item for opening up the Onboard Maintenance System. This is the oil aircraft systems monitoring that mechanics can use for deep trouble shooting. It is not used by pilots.