This document provides an overview of a maintenance and engineering training class on the master warning and caution lights on a Boeing 737-800 aircraft. The class will cover locating major components and describing their functions, panel operation and interface, electrical power distribution and control, routine servicing, minimum equipment lists, and troubleshooting. It provides information on the annunciator and dimming module location, its interface with other aircraft systems, recall check procedures, lamp replacement, and asks review questions at the end.

2. Maintenance & Engineering Training
Q
MASTER WARNING AND
CAUTION
ATA 31

3. Instructor Information
Instructor
Telephone: (
email:

4. Class Guidelines
Introductions

5. Got a train to catch?
Class Guidelines
Class times: 0800-1530

6. Lunch - 1130-1230
Class Guidelines

7. Rest Rooms
Class Guidelines

8. Breaks - Every 45 to 60 minutes
Class Guidelines

9. Building Safety & Security Considerations
Class Guidelines
Class Sign-In Sheet

10. Class Participation
Class Guidelines

11. The material cover on this course is for training and familiarization
purpose only and is not intended to supersede the Manufacturer
Maintenance Manual or any other regulatory approved data. Always
refer to your company procedures and never deviate from approved
Technical Data.
You are always responsible for the work you sign for.
Your SAFETY and those around you must be your #1 priority.

12. Introductions

13. • Name
• Company or Organization
• Responsibility
Introductions

14. Questions ???

15. General Familiarization and
Line Maintenance Class
for Master Warning and Caution
lights on Boeing 737-800

16. Student Objectives
QLocate Major Components and Describe
Their Functions
QDescribe Panel Operation and Interface
QDescribe Electrical Power, Control and
Distribution
QDescribe Routine Servicing
QReview MEL and Troubleshooting

17. Master Warning and Caution
The master caution system provides a visual alert to
the flight crew of unsafe airplane systems operation.

18. Master Warning and Caution

19. The annunciator and dimming
module is located above access
panels in the top of the nose
landing gear wheel well and is
mounted to the J19 panel which is
fastened to the bottom of the
flight compartment floor.

20. INTERFACE
Ground Signal

21. INTERFACE WITH A/C

23. * Flight control panel
* IRS master caution unit
* Flight control panel
* Generator drive and
standby power panel
* APU indicator panel
* Overheat/fire protection panel
* Window heat panel
* Hydraulic panel
* System annunciators
* Engine panel
* Flight recorder/Mach airspeed
warning panel
* Air conditioning/bleed air
control panel.

24. Recall Check
• When performing a Recall Check.
– Depress and hold either System Annunciator Light Panel.
– Verify that both MASTER CAUTION Lights illuminate.
– Verify all lights have illuminated in both Annunciator Light Panels.
– Release the System Annunciator Light Panel.
If the MASTER CAUTION Lights remain illuminated, with or without
individual System Annunciator Lights, investigate the cause.
Under normal condition (no other malfunctions, good weather, etc.), recall
faults that reset when the MASTER CAUTION Light is pressed are dispatchable
and should be written up at the next destination. It is not necessary to call
Maintenance or run abnormal procedures from the QRH in these instances.

25. ANNUNCIATION LIGHT
RESET and RECALL
46S

26. 6 Pack Warning and Caution
Lamp Replacement
CAUTION: REMOVE THE LAMP HOUSING WITH
YOUR FINGERS ONLY. IF YOU USE A TOOL TO HOLD
THE LAMP HOUSING, THE TOOL CAN CAUSE
DAMAGE TO THE HOUSING.

27. MEL

28. REVIEW
• The six pack lights are control by applying voltage or ground?
• What side is the hydraulic warning for the six-pack indicator located?
• What controls the brightness of the warning indication system?

29. Q&A