Agusta SB 69-178: No revision named

N° 1 69-178 DAT E: August 4, 2020 REV. : / - Ju ly 10, 2020 Pag e 1 of 27 TITLE ATA 64 - TR FLIGHT CONTROL PERIODICAL INSPECTION FOR IMPROVED DUPLEX BE ARING

REVISION LOG First issue.

Leonardo S.p.A.

Via Giovanni Agusta, 520 21017 Cascina Costa di Samarate (VA) Italy Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595 An appropriate entry should be made in the aircraft log book upon accomplishment.

If ownership of aircraft has changed, please, forward to new owner.

EMERGENCY ALERT

SERVICE BULLETIN

S.

B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 2 of 27 REVISION: /

1. PLANNING INFORMATION A. EFFECTIVITY Part I: All AW 169 helicopters equipped with Tail Rotor Duplex Bearing P /N MM6430V00151 and TRA P/N 6F6730V00331.

Part II: All AW 169 helicopters equipped with Tail Rotor Duplex Bearing P/N MM6430V00151.

Part III: All AW 169 helicopters equipped with Tail Rotor Duplex Bearing P/N MM6430V00151.

Part IV: All AW 169 helicopters equipped with Tail Rotor Duplex Bearing P/N MM6430V00151.

B. COMPLIANCE

GENERAL NOTE A non-cumulative tolerance of 10% may be applied to the compliance times specified in this SB to allow synchronization of the required inspections with other required maintenance tasks for which a non-cumulative tolerance is already granted in the applicable Maintenance Manual.

Part I:

Within 10 FH from any installation of TR Duplex Bearing P/N MM6430V00151. Then repeat the inspection every 10 FH.

NOTES

• Every time it is required to perform Part II, accomplishment of Part I on the same maintenance downtime must be performed as a prerequisite.

• If Part III is required in the same maintenance downtime of Part II, it shall be performed lastly.

Part II:

Within 50 FH from any installation of TR Duplex Bearing P/N MM6430V00151. Then repeat the inspection every 50 FH.

Part III:

Upon any installation of TR Duplex Bearing P/N MM6430V00151. Then repeat the inspection every 100 FH.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 REVISION: / Page 3 of 27 NOTES

• Perform in sequence Part I and Part II as a prerequisite.

• If Part III is required in the same maintenance downtime of Part IV, it shall be performed after Part IV.

• The operations performed in accordance with Part IV of this SB covers also the already approved AMPI Maintenance Task (i.e. MT 64- 07, required every 400 FH).

Part IV:

Within 100 FH from any installation of TR Duplex Bearing P/N MM6430V00151. Then repeat the inspection every 100 FH.

C. CONCURRENT REQUIREMENTS N.A.

D. REASON This Service Bulletin is issued in order to require the periodical inspection of the slippage marking of the back-end castellated nut of the TR servo-actuator, the introduction of a new Thermal strip and the periodical detailed inspection of the new improved TR duplex bearing.

E. DESCRIPTION Following the introduction on in-service fleet of the new improved TR Duplex Bearing P/N MM6430V00151, this Service Bulletin provides the instructions for the new inspection regime, partially requiring some of the checks already requested by SB 169-148 on previous TR Duplex Bearing P/N 4F6430V00551.

In details, Part I of this Service Bulletin provides the periodical detailed inspection of the slippage marking of the castellated nut installed on the back end of the TRA P/N 6F6730V00331, retaining the requirements of Part I of SB 169-148.

Part II partially retains the requirement of the Parts II, IV and V of the SB 169-148, requiring the detailed inspection of TR duplex bearing, in addition to the verification of particle presence in the grease and the recursive check of the Thermal strip.

Part III provides the instructions to install a new dedicated Thermal strip in the area of the TR duplex bearing.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 4 of 27 REVISION: / Part IV partially retains the requirement of the Parts II and VI of the SB 169-148, requiring a check for axial play and a roughness check of the duplex bearing to be performed after removal of the spider assembly.

Incorrect installation of the TR servo-actuator back-end nut or seizure of the TR Duplex bearing may lead to loss of Tail Rotor control which, depending on the flight condition, could lead to loss of control of the aircraft.

Feedback on the compliance to this Service Bulletin is required.

F. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA nr. EASA.21.J.005. For helicopters registered under other Aviation Authorities, before applying the Service Bulletin, applicable Aviation Authority approval must be checked within Leonardo Helicopters customer portal.

E.A.S.A. states mandatory compliance with inspections, modifications or technical directives and related time of compliance by means of relevant Airworthiness Directives.

If an aircraft listed in the effectivity embodies a modification or repair not LHD certified and affecting the content of this Service Bulletin, it is responsibility of the Owner/Operator to obtain a formal approval by Aviation Authority having jurisdiction on the aircraft, for any adaptation necessary before incorporation of the present Service Bulletin.

G. MANPOWER To comply with this Service Bulletin the following MMH are deemed necessary:

Part I: approximately half (0.5);

Part II: approximately two (2);

Part III: approximately one (1);

Part IV: approximately three (3);

MMH are based on hands-on time and can change with personnel and facilities available.

H. WEIGHT AND BALANCE N.A.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 REVISION: / Page 5 of 27 I. REFERENCES

1) PUBLICATIONS

DATA MODULE DESCRIPTION PART DM01 69-A-00-20-00-00A-120A-A Helicopter on ground for a safe maintenance.

I, II, III,

IV, V, VI DM02 69-A-06-40-00-00A-010A-A Access door provision I, II DM03 69-A-64-31-01-00A-520A-A Pitch link - Remove procedure II DM04 69-A-64-21-05-00A-520A-A Lightning conductor jumper – Remove procedure II DM05 69-A-64-31-03-00A-520A-A Spider plug - Remove procedure II, III, IV, V, VI DM06 69-A-64-31-03-00A-720A-A Spider plug - Install procedure II, III, IV, V, VI DM07 69-A-64-31-02-00A-520A-A Scissors group – Remove procedure II DM08 69-A-64-31-07-00A-520A-A Boot - Remove procedure II DM09 69-A-64-31-04-00A-520A-A Sliding control assy – Remove procedure II, VI DM10 69-A-64-31-04-00A-720A-A Sliding control assy – Install procedure II, VI DM11 69-A-64-31-05-00A-520A-B Duplex bearing - Remove procedure

II, IV, V, VI DM12 69-A-64-31-05-00A-720A-B Duplex bearing - Install procedure II, IV, V, VI

2) ACRONYMS SB Service Bulletin DM Data Module DOA Design Organization Approval EASA European Aviation Safety Agency LHD Leonardo Spa Helicopters MMH Maintenance Man Hours SB Service Bulletin FH Flight Hours TR Tail Rotor TRA Tail Rotor Actuator

3) ANNEX N.A.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 6 of 27 REVISION: / J. PUBLICATIONS AFFECTED N.A.

K. SOFTWARE ACCOMPLISHMENT SUMMARY N.A.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 REVISION: / Page 7 of 27

2. MATERIAL INFORMATION A. REQUIRED MATERIALS

1) PARTS # P/N ALTERNATIVE P/N DESCRIPTION Q.TY LVL NOTE LOG P/N 1 M06SHA094D01R1 Thermal Strip 1 . (1)(2) - 2 LAMHALPATCH01R1 Protective layer 1 . (1) -

Refer also to AW169 IPD for the spares materials required to comply with the AMP DMs referenced in the accomplishment instructions.

2) CONSUMABLES The following consumable materials, or equivalent, are necessary to accomplish this Service Bulletin:

# Spec./LHD code number DESCRIPTION Q.TY NOTE PART 3 TT-N-95-B / Code No. 531055030 Aliphatic Naphtha (C059) AR (3) II,III

Refer to AW169 AMDI for the consumables required to comply with the AMP DMs referenced in the accomplishment instructions.

3) LOGISTIC MATRIX N.A.

NOTE

(1) This item, strictly required for Part III embodiment, may be required on condition also within the embodiment of other Parts of this SB.

(2) Identification on label M06SHAL094D01R1 is printed on the thermal strip.

(3) Item to be furnished as local supply.

B. SPECIAL TOOLS Refer to ITEP for the special tools required to comply with the AMP DMs referenced in the accomplishment instructions.

C. INDUSTRY SUPPORT INFORMATION Owners/Operators who comply with the instructions of this Service Bulletin no later than the applicable date in the “Compliance” section will be eligible to receive REQUIRED MATERIALS on free of charge basis, except for Consumable Materials and Special Tools.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 8 of 27 REVISION: / NOTE: Customers who fail to comply with the instructions in this Service Bulletin before the compliance date are not eligible for the aforementioned special policy.

Please Issue relevant MMIR form to your Warranty Administration Dpt.

NOTE: WRM will include RETURN MATERIAL AUTHORIZATION (RMA) number; the unit disembarked from the aircraft has to be returned to LHD within thirty (30) calendar days after the shipment of the replacement part. In case of missing return within thirty

(30) calendar days, Customer will be invoiced for the price of the replacement part.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 REVISION: / Page 9 of 27

3. ACCOMPLISHMENT INSTRUCTIONS

GENERAL NOTES

a) Place an identification tag on all components that are re-usable, including the attaching hardware that has been removed to gain access to the modification area and adequately protect them until their later re-use.

PART I

1. In accordance with AMP DM 69-A-00-20-00-00A-120A-A, prepare the helicopter on ground for a safe maintenance. Disconnect the battery, all electrical power sources and/or the external power supply.

NOTE Removal of access panels 470AT and 470BT can be avoided if visual access to the inspection area is available by other means. A suitable borescope can be used for this purpose.

2. In accordance with AMP DM 69-A-06-40-00-00A-010A- A remove the access panels 470AT and 470BT.

3. Take a picture of the back-end area of the TRA clearly showing the slippage mark, and keep a record in a local archive to be made available if required.

4. With reference to Figure 1, check the slippage mark on the castellated nut for absence of evidence of rotation between the parts. Record the result on Table I on Figure 5.

5. If any evidence of rotation is found, contact the Product Support Engineering (engineering.support.lhd@leonardocompany.com) to receive further instructions before performing the following checks:

5.1 Send the picture taken at step 3 to Product Support Engineering (engineering.support.lhd@leonardocompany.com).

5.2 If the helicopter is already compliant with the SB 169-140, perform HUMS data download from AMMC to DTD. Upload the HUMS data to Heliwise.

5.3 Perform Thermal strip and TR Duplex bearing detailed inspection as per Part II of this SB;

5.4 In case replacement of Duplex Bearing is confirmed as necessary, perform step

6.3 of Part II of this SB.

6. If no evidence of rotation is found in step 4, return the helicopter to a ready to flight condition and record for compliance with Part I of this Service Bulletin on the helicopter

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 10 of 27 REVISION: / logbook.

7. Send the attached compliance form and the compiled Table I to the following mail box:

engineering.support.lhd@leonardocompany.com As an alternative, gain access to My Communications section on Leonardo WebPortal and compile the “Service Bulletin Application Communication”.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 REVISION: / Page 11 of 27

PART II

1. In accordance with AMP DM 69-A-00-20-00-00A-120A-A, prepare the helicopter on ground for a safe maintenance. Disconnect the battery, all electrical power sources and/or the external power supply.

NOTE If not damaged, the O-ring removed in the following step can be retained for later reinstallation.

2. In accordance with AMP DM 69-A-64-31-03-00A-520A- A, remove the spider plug.

3. Perform the inspection of the Thermal Strip as detailed below:

3.1 With reference to Figure 2, check the thermal strip and the protective layer for good adhesion and general condition, and the thermal strip only for readability;

then proceed as follows:

3.1.1 If the strip and/or the protective layer are detached, partially detached, damaged or unreadable, perform steps 3.1.2 thru 3.1.6, otherwise skip to step 3.2:

3.1.2 perform the TR duplex bearing inspection in accordance with step 4;

3.1.3 If helicopter is already compliant with the SB 169-140, perform HUMS data download from AMMC to DTD. Upload the HUMS data to Heliwise

3.1.4 Contact the Product Support Engineering (engineering.support.lhd@leonardocompany.com) to receive further instructions;

3.1.5 Replace the thermal strip in accordance with the instructions reported in Part III of this SB;

3.1.6 Skip to step 7.

3.2 If any of the Thermal Strip cells appears coloured, provide a picture of the Thermal Strip to Product Support Engineering (engineering.support.lhd@leonardocompany.com), then proceed with the following step.

3.3 With reference to Figure 5, check the temperature reached by the thermal strip installed on spacer P/N MM6430A00151.

3.4 Record the check result on Table II (refer to Figure 6) and provide the Table and the Compliance Form to Product Support Engineering, as required by step 8.

3.5 If temperature has reached a value equal to or above 104°C, proceed with steps

3.5.1 thru 3.5.4, otherwise skip to step 4:

3.5.1 perform the TR duplex bearing inspection in accordance with step 4 thru step 5.

S.B. N°169-178 EMERGENCY ALERT DATE: August 4, 2020 Page 12 of 27 REVISION: /

3.5.2 If the helicopter is already compliant with the SB 169-140, perform HUMS data download from AMMC to DTD. Upload the HUMS data to Heliwise.

3.5.3 Contact immediately the Product Support Engineering (engineering.support.lhd@leonardocompany.com) to receive further instruction before thermal strip and duplex bearing removal and replacement.

3.5.4 In case replacement of Duplex Bearing is confirmed as necessary, perform steps 6.3 of Part II of this SB.

4. Perform the inspection of the TR duplex bearing in accordance with the following procedure:

4.1 Inspect the visible parts of the TR duplex bearing (including the seals) for absence of wear, damages and security of attachment. Record the results on Table II (refer to Figure 6).

4.2 Check the visible part of the TR duplex bearing for particles absence.

CAUTION Pay attention not to damage the thermal strip and the protective layer during the grease sampling from the bearing housing.

4.3 If any grease leakage is present on the visible part of the TR Duplex Bearing and/or on the spider plug, confirm absence of any particles by finger touch.

4.4 Perform grease inspection for magnetic/metallic particles as detailed below:

4.4.1 Put a small quantity of grease using a small spatula in a transparent container and add a solvent (aliphatic naphtha). Then use a magnet on the bottom out side of the container to confirm absence of magnetic particles in the solution.

4.4.2 Record the result on Table II (refer to Figure 6) and collect the grease leaked from the visible surface in a proper container.

5. If none of the checks performed in steps 4.1 thru 4.4.1 fails, proceed as follows, otherwise skip to step 6:

5.1 If helicopter is already compliant with the SB 169-140, perform HUMS data download from AMMC to DTD. Upload the HUMS data to Heliwise.

5.2 Skip to step 7.

6. If any of the checks performed in steps 4.1 thru 4.4.1 fails, perform the following operations:

6.1 If helicopter is already compliant with the SB 169-140, perform HUMS data