Engine Start Procedures
Definition
Engine start procedures refer to the standardized steps and checks that pilots perform to safely start an aircraft’s engine(s). These procedures are aircraft-specific, guided by manufacturer checklists, and often coordinated with ground crew, especially during pushback or ramp operations. Safe engine starts are critical for avoiding equipment damage, personnel injury, or runway incursions due to unintended movement.
Purpose
- Initiate engine operation with correct fuel, air, and ignition sequencing
- Ensure system readiness, including oil pressure and electrical supply
- Prevent hot starts, hung starts, or compressor stalls
- Coordinate with external power or air sources as needed
- Safely transition the aircraft from ground power to engine-generated power
When Engine Start Occurs
General Engine Start Sequence
| Step | Action |
|---|---|
| 1 | Confirm clearance – ATC start-up/pushback approval if required |
| 2 | Beacon ON – Turn on anti-collision light (beacon) before start |
| 3 | Power source check – Ground power, APU, or internal battery available |
| 4 | Engine start checklist – Run through flow items (fuel pump, ignition, etc.) |
| 5 | Start selected engine – Usually engine 2 first, using start switch/selector |
| 6 | Monitor parameters – N1/N2 rotation, oil pressure, EGT, fuel flow |
| 7 | Stabilization – Idle power confirmed, all values in limits |
| 8 | Repeat for second engine – If applicable |
| 9 | Generator/bleed setup – Switch electrical and pneumatic systems as needed |
| 10 | Inform ground crew – “Engine start complete, ready for disconnect.” |
Engine Start Types
| Type | Description |
|---|---|
| Battery start | Small aircraft using internal battery power |
| APU-assisted start | APU provides bleed air and electrical power |
| Ground power/air cart start | Requires external connection for startup (common in jets) |
| Cross-bleed start | One running engine powers start of another (if needed) |
Phraseology Examples
| Pilot | Ground Crew / ATC |
|---|---|
| “Ready for engine start, brakes set.” | “Clear to start engines.” |
| “Starting engine two.” | — |
| “Engine two stabilized.” | “Push complete, towbar disconnected.” |
| “Start complete, request taxi.” | “Taxi to holding point runway 27 via Bravo.” |
Typical Engine Start Indicators (Jet Example)
| Parameter | Normal Range |
|---|---|
| N1/N2 rotation | Increasing smoothly |
| EGT | Rises during ignition but stays within limits |
| Oil pressure | Rises rapidly after light-off |
| Fuel flow | Begins at ignition |
| Vibrations | Within normal tolerances |
Warnings and Malfunctions
| Type | Cause | Action |
|---|---|---|
| Hot start | Excessive EGT | Cut fuel, motor engine to cool |
| Hung start | N2 stalls below idle | Abort start, retry or use alternate air source |
| No light-off | Ignition failure | Abort and investigate |
| High vibration or oil pressure | Mechanical issue | Abort and request maintenance |
Safety Considerations
- ✅ Confirm area is clear of personnel, vehicles, and FOD
- ✅ Ensure beacon light ON before starting
- ✅ Monitor all engine gauges closely
- ✅ Keep communication with ground crew active and clear
Tips for Pilots
- Always follow aircraft-specific checklists
- Practice engine starts using LearnATC simulation tools
- In cold weather, allow extra time for oil pressure stabilization
- Use the “challenge–response” method in multi-crew ops
