Maintenance of the typical turbine engine ignition system consists primarily of inspection, test, troubleshooting, removal, and installation.
Inspection of the ignition system normally includes the following:
- Ignition lead terminal inspection; ceramic terminal should be free of arcing, carbon tracking and cracks.
- The grommet seal should be free of flashover and carbon tracking. [Figure 4-71]
- The wire insulation should remain flexible with no evidence of arcing through the insulation.
- Inspect the complete system for security of component mounting, shorts or high-voltage arcing, and loose connections.
Check System Operation
The igniter can be checked by listening for a snapping noise as the engine begins to turn, driven by the starter. The igniter can also be checked by removing it and activating the start cycle, noting the spark across the igniter.
CAUTION: The high energy level and voltage associated with turbine ignition systems can cause injury or death to personnel coming into contact with the activated system.
Tighten and secure as required and replace faulty components and wiring. Secure, tighten, and safety as required.