DOC AIRBUS | AMM A320FWind Limitations During Engine Ground Operations [CFMI]
TASK 71-00-00-869-005-A
Wind Limitations During Engine Ground Operations
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
3. Job Set-up
Subtask 71-00-00-869-054-A ** ON A/C NOT FOR ALL
Subtask 71-00-00-869-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:21:20 UTC
Wind Limitations During Engine Ground Operations
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
Subtask 71-00-00-869-054-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 71-00-00-869-051-A ** ON A/C NOT FOR ALL
A. Windmilling limitation
Preferred Relative Wind Direction and Velocity Limitations For Power Settings of 90 Percent N1 RPM ** ON A/C NOT FOR ALL
(a) Static ground operation is restricted to power settings of 70 percent N1 RPM and below with crosswinds exceeding 20 knots or with tailwind of 5 to 10 knots.
(b) Static ground operation is restricted settings of 80 percent N1 RPM and below with crosswinds of 10 to 20 knots or tailwinds of 2 to 5 knots.
(c) Static ground operation is restricted settings of 90 percent N1 RPM and below with crosswinds up to 10 knots or tailwinds up to 2 knots.
Whenever possible, the aircraft should be turned directly into the wind.
In addition to observing these maximum wind velocities, power assurance runs are restricted if wind velocity variation exceeds 5 knots.
(d) Tailwinds, or winds with tailwind components, adversaly affect ground operation of the engines. During starting, and at idle or low power settings, excessive EGT can result. At power settings or approximately 90 percent N1 RPM and above, fan tip stall can be caused. The onset of fan tip stall during steady state operation may be recognized by unstable N1 RPM manifested by rapidly increasing excursions, airplane vibration and a pulsating, blowtorch type of sound. Whenever a fan tip stall is imminent or as occured, rapid retardation of the thrust lever will prevent, or permit recovery from the stall.
NOTE: If the engine has an inoperative lubrication system, the windmilling must be restricted to 6 hours. There is no limitation for an engine with an operative lubrication system.
(1) Wind Limitations during Engine Ground Operations. Preferred Relative Wind Direction and Velocity Limitations For Power Settings of 90 Percent N1 RPM ** ON A/C NOT FOR ALL (b) Static ground operation is restricted settings of 80 percent N1 RPM and below with crosswinds of 10 to 20 knots or tailwinds of 2 to 5 knots.
(c) Static ground operation is restricted settings of 90 percent N1 RPM and below with crosswinds up to 10 knots or tailwinds up to 2 knots.
Whenever possible, the aircraft should be turned directly into the wind.
In addition to observing these maximum wind velocities, power assurance runs are restricted if wind velocity variation exceeds 5 knots.
(d) Tailwinds, or winds with tailwind components, adversaly affect ground operation of the engines. During starting, and at idle or low power settings, excessive EGT can result. At power settings or approximately 90 percent N1 RPM and above, fan tip stall can be caused. The onset of fan tip stall during steady state operation may be recognized by unstable N1 RPM manifested by rapidly increasing excursions, airplane vibration and a pulsating, blowtorch type of sound. Whenever a fan tip stall is imminent or as occured, rapid retardation of the thrust lever will prevent, or permit recovery from the stall.