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

After receiving clearance from ATC for “Start-up and Pushback” (at controlled airports)
Before taxiing at uncontrolled aerodromes (self-coordinated)
In sequence: either before, during, or after pushback (depending on SOP)

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