Airframe Vibration due to the Rudder

TASK 27-20-00-810-802-A
Airframe Vibration due to the Rudder

1. Possible Causes

rudder servo controls
hinge bearings
rudder fitting attachments N°1/2/3/4/5 and 7
eye-end of servo control
servo control attachments

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 05-50-00-810-801-A	Identification of the Cause of In-Flight Airframe Vibrations and/or Noises
AMM 27-24-00-200-001	Check of the Rudder Servo Controls and Hinge Bearings for too much Play and Condition
AMM 27-24-00-200-002	Check of the Rudder Trailing Edge Play
AMM 27-24-51-000-001	Removal of the Rudder Servo Control
AMM 27-24-51-000-003	Removal of the Rudder Servo Control Eye End
AMM 27-24-51-200-001	Check of the Rudder Servo Control Attachments
AMM 27-24-51-400-001	Installation of the Rudder Servo Control
AMM 27-24-51-400-003	Installation of the Rudder Servo Control Eye End
AMM 27-24-51-960-001	Replacement of the Rudder Servo-Control Bearings
AMM 55-46-00-200-001	Inspection of the Rudder Hinge Line Fittings 1 to 7 for wear.

3. Fault Confirmation
Subtask 27-20-00-700-050-A

A. Test
(1) Make sure that you identify the cause of the vibration correctly (Ref. TSM TASK 05-50-00-810-801).

4. Fault Isolation
Subtask 27-20-00-810-051-A ** ON A/C NOT FOR ALL

A. If the source of airframe vibrations is the rudder:

Do a check of the rudder trailing-edge play AMM 27-24-00-200-002, refer to the play values recorded and do the applicable steps that follow:

(1) If the measured play value is more than 16 mm (0.6299 in.) for at least one of the servo controls:
(a) Do a check of the rudder servo controls and hinge bearings for too much play and condition AMM 27-24-00-200-001.

NOTE: If the fault occurs during the subsequent flights, do the step 4.A. again.

(2) If the measured play value is less than 10 mm (0.3937 in.) for the three servo controls, do a check of the rudder fitting attachments N°1/2/3/4/5 and 7 AMM 55-46-00-200-001.

NOTE: Do not check the rudder fitting attachment N°6.

(3) For all the other cases, do the steps that follow only for the servo control(s) with a trailing edge play of 10 mm (0.3937 in.) or more.
(a) Replace the eye-end of servo control AMM 27-24-51-000-003, AMM 27-24-51-400-003.
(b) Do again the check of the rudder trailing-edge play AMM 27-24-00-200-002:

If the new measured play values are less than the values recorded before for one servo control minimum, no other maintenance action is necessary.
If the new measured play values are equal to the values recorded before (+ or - 1 mm (0.0394 in.)) for the three servo controls or,
If the fault occurs during the subsequent flights,
Do these steps:

1 Replace the servo control bearing (body side) AMM 27-24-51-960-001.

NOTE: If the swaging tool or servo control bearing is not available, replace the servo control.

2 Do again the check of the rudder trailing-edge play AMM 27-24-00-200-002:

If the new measured play values are less than the values recorded before for one servo control minimum, no other maintenance action is necessary.
If the new measured play values are equal to the values recorded before (+ or - 1 mm (0.0394 in.)) for the three servo controls or,
If the fault occurs during the subsequent flights, do the step 1_ again.

3 Do a check of the servo control attachments AMM 27-24-51-200-001.
4 Do again the check of the rudder trailing-edge play AMM 27-24-00-200-002:

If the new measured play values are equal to the values recorded before (+ or - 1 mm (0.0394 in.)) for the three servo controls or,
If the fault occurs during the subsequent flights,
do a check of the rudder fitting attachments N°1/2/3/4/5 and 7 AMM 55-46-00-200-001.

NOTE: Do not check the rudder fitting attachment N°6.

Subtask 27-20-00-810-051-C ** ON A/C NOT FOR ALL

A. If the source of airframe vibrations is the rudder:
(1) Do a check of the rudder trailing-edge play AMM 27-24-00-200-002.
(a) If the measured play value is equal or more than 12 mm (0.4724 in.) for at least one of the servocontrols:

Do a check of the rudder servo controls and hinge bearings for too much play and condition AMM 27-24-00-200-001.

(b) If the play is less than 12 mm (0.4724 in.) for all the three servo controls, do the steps that follow:
1 Do a check of the rudder fitting attachments 1/2/3/4/5 and 7 AMM 55-46-00-200-001.

NOTE: Do not check the rudder fitting attachment N°6.

2 Do a check of the rudder trailing-edge play AMM 27-24-00-200-002.
a If the measured play value is :

Reduced by more than 1 mm (0.0394 in.), no other maintenance action is necessary.
Reduced by less or equal than 1 mm (0.0394 in.), replace the rudder servocontrol AMM 27-24-51-000-001 and AMM 27-24-51-400-001.

3 Then, do again a check of the rudder trailing-edge play AMM 27-24-00-200-002.
4 If the measured play is:

Reduced by more than 1 mm (0.0394 in.), no other maintenance action is necessary.
Reduced by less or equal than 1 mm (0.0394 in.), do a check of the servocontrol attachments AMM 27-24-51-200-001.

[Rev.8 from Aug 2018] 2026.04.04 04:27:29 UTC