P.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421 TO: HOLDERS OF SA227 COMMUTER CATEGORY SERVICE INFORMATION MANUALS

Attached is Revision 2 of SA227 Commuter Category Service Bulletin CC7-27-026, Inspection and Lubrication of the Aileron Control Cable Chain in the Pilot's and Copilot's Control Columns, Issued: June 06, 2013, Revised: October 23, 2013.. Revision 2 revises step 1.D. Compliance, steps 1.D.(1)(a) and (b), 1.D.(2), 1.D.(2)(a). It also revisessteps 1.D.(3) and 1.D.(3)(a). Step 1.D.(3)(d)1) is revised to include "not to exceed 24 calendar months from the date of this bulletin" statement. It also revises step 1.D.(4) and adds 1.D.(4)(a). It revises step 1.D.(5)(a). It adds step 1.D.(6). It revises Notes 1 and 2 and adds Note 3 in step 1.D. It revises steps 2.A.(4), 2.A.(5), and 2.A.(6)(b). Corrects issue date to June 6, 2013. Please insert the attached revised Chapter 27 Index pages.P.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421CHAPTER 27–FLIGHT CONTROLS

Issued: May 19, 1994 CHAPTER 27 INDEX Page 3 of 4 NUMBER DATE TITLE AIRCRAFT EFFECTIVITY 

### SA227 SERIES COMMUTER CATEGORY

27-021 Not Issued

27-022 Not Issued
27-023 09-19-08 Gravel Guard Installation All SA227 Commuter Category Airplanes 27-024 06-10-11 Inspection and Repair / All SA227 Commuter (R) 09-06-11 Replacement of Pitch Trim Category Airplanes (R) 10-14-11 Actuator Fuselage Fittings

27-025 05-17-11 SAS Power Advance Indicator All SA227 Commuter Lights Modification Category Airplanes 27-026 06-06-13 Inspection and Lubrication of All SA227 Commuter (R) 09-30-13 Aileron Control Cable Chain in Category Airplanes (R) 10-23-13 the Pilot's and Copilot's Control Columns

Revised: October 23, 2013CHAPTER 27 INDEX Page 4 of 4 Issued: May 19, 1994 CHAPTER 27 – FLIGHT CONTROLS
NUMBER DATE TITLE AIRCRAFT EFFECTIVITY 

### SA227 SERIES COMMUTER CATEGORY

INTENTIONALLY LEFT BLANK

Revised: June 10, 2011Issued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 1 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY


### Flight Controls Lubrication of the Aileron Control Cable Chain in the Pilot's and Copilot's Control Columns

1. PLANNING INFORMATION A. Effectivity: All SA227-CC/-DC Airplanes
B. Reason: An operator has reported an incident where the ailerons became jammed in flight due to the aileron control cable chain climbing back on itself and jamming within the control column housing. There was no report of stiffness or difficulty in the controls by the pilot prior to this incident. The chains had never been replaced by the operator since manufacture. Revision 2 revises step 1.D. Compliance, steps 1.D.(1)(a) and (b), 1.D.(2), 1.D.(2)(a). It also revisessteps 1.D.(3) and 1.D.(3)(a). Step 1.D.(3)(d)1) is revised to include "not to exceed 24 calendar months from the date of this bulletin" statement. It also revises step 1.D.(4) and adds 1.D.(4)(a). It revises step 1.D.(5)(a). It adds step 1.D.(6). It revises Notes 1 and 2 and adds Note 3 in step 1.D. It revises steps 2.A.(4), 2.A.(5), and 2.A.(6)(b). Corrects issue date to June 6, 2013. C. Description: Inspect the pilot's and copilot's aileron control cable chains in the control columns for defective condition or wear. Replace the bearings and chain sprocket inside eachcontrol column. Ensure the instructions for chain/sprocket lubrication during replacement is performed to prevent jamming. D. Compliance: Mandatory Comply with this service bulletin within the compliance times specified unless already done. (1) For aircraft that have records showing replacement of the control column chains andlubrication(using the correct lubricant per Table 1) at installation, perform the following: (a) Replace and lubricate the chain, sprocket, and bearings by 10,000 hours or 13 years, from the date of the last chain replacement, or within the next 24 months from the date of of this service bulletin, whichever occurs later.Issued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 2 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

NOTE: The 27-71026-001 aileron control chain is usually sold as part of the aileron control cable assembly. Replacement of this control cable assembly (includ ing the chain) complies with the chain replacement requirement of this service bulletin. (b) Check aileron control cable tension at the same time as step 1.D.(1)(a). (2) For aircraft that have records showing the chains were replaced within the last 10,000 hours, but does NOT indicate if they were lubricated, perform the following: (a) Comply with step 1.D.(3)(a), (b), and (c) by 10,000 hours aircraft time since last chain replacement or within the next 1,000 hours, whichever occurs later, but not to exceed 24 calendar months from the date of this bulletin. (3) For aircraft that have no records showing replacement of the control column chains within the last 10,000 hours, perform the following: (a) Replace and lubricate the control chain during installation in each control column. This can be coordinated with aileron control cable replacement if desired. (b) Replace the sprocket and two bearings (see Table 1) in each control column. (c) Check aileron control cable tension. (d) Comply with (a) and (b) within the following schedule: 1) For aircraft with less than 10,000 hours Total Aircraft Time (TAT), perform by 10,000 hours or within the next 1,000 hours, whichever occurs later, not to exceed 24 calendar months from the date of this bulletin. 2) For aircraft with 10,000 - 20,000 hours TAT, perform within the next 1,000 hours or 12 calendar months, whichever occurs first, from the date of this service bulletin. 3) For aircraft with 20,001 - 30,000 hours TAT, perform within the next 750 hours or 6 calendar months, whichever occurs first, from the date of this service bulletin. 4) For aircraft with 30,001 hours TAT or more, perform within the next 400 hours or 3 calendar months, whichever occurs first, from the date of this service bulletin. (4) Repetitive Replacement: On a repetitive basis, perform replacement per step 1.D.(4)(a). Ensure the chain is lubricated during installation. The 27-71026-001 aileron control chain is usually sold as part of the aileron control cable assembly. Replacement of this control cable assembly (including the chain) complies with the chain replacement requirement of this service bulletin. See step 2. (a) Replace and lubricate the chain, sprocket, and bearings by 10,000 hours or 13 years from the date of the last chain replacement, whichever occurs first. Check aileron control cable tension. (5) For aircraft that are choosing to follow the inspection option of the ST-UN-M003 Airframe Airworthiness Limitations Manual (see ATA 27-00, item 10-1), which has anIssued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 3 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

initial inspection of 10,000 hours and a repeat inspection of 400 hours, the action with regards to the control column chain is hereby clarified: (a) The control column chain, sprocket, and bearings shall be replaced following the repeat requirements of step 1.D.(4)(a). See step 1.D.(3) for compliance of initial replacement. The chain/sprocket must be lubricated and the aileron control cable tension should be checked. (b) The ST-UN-M003 item remains in effect, with the owner/operator choosing to continue to inspect, or replace the cables (NOT including the control column chains). (6) See step 2 for accomplishment instructions NOTE: 1. It is permissible to perform the repeat replacement prior to the 10,000 hours (13 calendar years) to align the repeat action with other maintenance schedules of the operators. 2. The repeat replacement of the chains is currently implied as a requirement of theST-UN-M003 Airframe Airworthiness Limitations Manual. However, the requirement is placed against the aileron control cable assembly. This service bulletin clarifies that this aileron control cable assembly INCLUDES the aileron control column chain. This bulletin states that the chain, sprocket, and bearings must be replaced every 10,000 hours with additional calendar time requirements as defined by step 1.D.(4). 3. Aircraft that have already complied with this bulletin at an earlier revision do not have to repeat the initial action outlined in steps 1.D.(1) thru 1.D.(3). They may proceed with repeat replacement per step 1.D.(4). E. Approval: FAA Approved for Engineering Design. F. Manpower: M7 Aerospace estimates 20 manhours to perform the actions of this service bulletin. This estimate includes time to gain access, perform the inspection, replacement and lubrication, and re-assembly of both control columns. This estimate is for direct labor only accomplished by an experienced crew. Adjust the estimate with operator task hour data if necessary. G. Material - Cost and Availability Contact M7 Aerospace Spares/Sales Department for Cost and Availability. See Table 1.Issued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 4 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

H. Tooling-Price and Availability: No special tooling is required. I. Weight and Balance: None NOTE: It is recommended the aircraft operating weight be re-established after incorporating 20 service bulletins classified as having negligible impact on aircraft weight and balance. This recommendation is derived from data provided in FAA Advisory Circular 120-27. J. Reference: SA227 Commuter Category Maintenance Manual. ST-UN-M003 Airframe Airworthiness Limitations Manual. M-5585 - M7 Aerospace Memorandum Aileron Control Chain Service Difficulty Report (SDR).
NOTE:References are for manufacturers’ use only. K. Other Publications Affected: SA227 Commuter Category Maintenance Manual, Chapters 05-10-00, 12-20-10, and 27-10-10. SA227 Commuter Category Illustrated Parts Catalog, Chapter 27-10-40. SA227 Commuter Category Phase Inspection Manual, Form 603. SA227 Commuter Category Letter Check Inspection Manual, Letter Check B, Flight Compartment Items 23. ST-UN-M003 Airframe Airworthiness Limitations Manual, Figure Item 10-1.

2. ACCOMPLISHMENT INSTRUCTIONS A. For replacement of any or all chain, sprocket, and bearings; perform the following: Gain access to pilot's and copilot's control columns in the cockpit by removing any floor panels, kick panels, and control column boots as required. Refer to SA227 Commuter Category Illustrated Parts Catalog (IPC), Chapter 25-10-20, Figure 1 for cockpit upholstery details, and Chapter 53-30-30, Figure 1 for floorboard details. Retain all hardware for reinstallation of same. (1) Remove access panels on each control column vertical post to access the chain (27- 71026-001) if required. Retain hardware for reinstallation. (2) Remove the lower access panel on the pilot's side control column only (which gives access to the cable turnbuckle). Refer to SA227 Commuter Category Illustrated Parts Catalog (IPC), Chapter 27-10-40, Figure 2 for details. Retain all hardware. (3) Follow the guidelines per SA227 Commuter Category Maintenance Manual, Chapter 27-10-10, for control wheel disassembly (ref SA227 Illustrated Parts Catalog forIssued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 5 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

details of control wheel). This gives access to the chain (27-71026-001), sprocket , and bearings on the control wheel. (a) The February 1987 FACTS article contained some helpful advice for removal of the control wheel assembly which is reprinted here. The process of removing the control wheel assembly is complicated because removal is hampered by interference of electrical wiring. A modified tool for breaking loose the control wheel nut is made by making a cutout on a special 1-1/4 inch socket as shown in Figure 1 below. This tool will clear all wiring at the control wheel nut and save precious time while, at the same time, protecting the wiring from damage. (4) Replace the sprocket and bearings with those contained in Kit 26K71004-001 per Table 1 in the Materials Listing (step 3.). The bearings are located in the front and rear supports (26-71009-003) in the control wheel assembly. Visually inspect the removed sprocket and the existing chain with 10X magnification and good light for chips, gouges, damaged rollers, missing teeth, peeling metal, and signs of abnormal wear. (5) Replace the chain. (6) Lubricate control wheel chain with Table 1 lubricant (by hand) per SA227 Commuter Category Maintenance Manual, Chapter 12-20-10. Note the following points (a) thru (c). (a) The current Maintenance Manual instructions apply a Corrosion Preventative (CP) as well as a lubricant. This reference to the CP will be removed from Chapter 27-00-00 at a later date. Until the Maintenance Manual is revised, the instructions for lubrication shall follow this bulletin and NOTapply the CP to the chain. NOTE: The CP ISapplicable to the cable. (b) When the aircraft was delivered from the factory, or new chains are supplied from the factory, the CP was/is installed. The chain must be cleaned to remove the CP prior to the application of the lubricant. Clean the chain with a degreasing solvent per MIL-PRF-680 or equivalent.

CAUTION: SEVERAL OF THE TYPE OF SOLVENTS PER THIS SPECIFICATION ARE FLAMMABLE (E.G. MINERAL SPIRITS) AND CAUTIONS SHALL BE TAKEN AS APPLICABLE. (c) Once the chain has been cleaned and dried, the lubricant can be added. Ensure the lubricant is added adequately to cover the length of the chain. Work the lubricant into the chain by exercising the chain by hand. (7) Ensure all other parts of the control wheel assembly are fit for service. (See Figure 2 for parts) (8) Restore the control wheel assembly to operating condition per SA227 Commuter Category Maintenance Manual, Chapter 27-10-10. (9) Reinstall all access panels on the control column removed in steps 2.A.(1) and 2.A.(2).Issued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 6 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

(10) Perform aileron control cable tension and rigging checks per SA227 Commuter Category Maintenance Manual, Chapter 27-00-00. (11) Reinstall all components, structure, and hardware per applicable sections of the SA227 Commuter Category Maintenance Manual. (12) Complete aircraft records in accordance with 14 CFR 43.9. (13) Complete and mail service bulletin Compliance Form to M7 Aerospace Technical Publications Department. Email: MetroTech@M7Aerospace.com. Fax: 210-820- 8626. 3. MATERIAL LISTING

TABLE 1 Notes: * Chain is usually sold as part of the aileron control cable assembly. However, this bulletin requests this specific chain be replaced. ** The bearing contained in the kit is the replacement for KP16B bearing. KP16B bearing still valid to use as replacement. (Continued next page) noitpircse D r ebmuNtra P y titnauQ

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‡recapSllam S 5 90-40017-6 2 R /AIssued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 7 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

*** MIL-PRF-81322 supercedes MIL-G-81322 however, MIL-G-81322 is still a valid grease touse in this application. This is a specification. Multiple products meet this specification. ****A degreasing solvent meeting the requirements of MIL-PRF-680 is suggested to be used to remove the Corrosion Preventative compound from the chain. Equivalent alternatives are permitted to remove this compound. Follow the solvents MSDS sheet for usage. ‡ Spacer, P/N 26-71004-025 ia a 0.090 inch thick spacer installed in earlier control column assemblies. This spacer was replaced by a 0.016 inch thick spacer, P/N 26-71004-095. This change was incorporated to provide improved adjustment of the control wheel assembly. The 26-71004-095 is sold in quantities of ten to ensure sufficient quantities are available at reassembly of the control wheel assembly. Each control wheel assembly (left hand or right hand) may require up to ten P/N 26-71004-095 spacers. Refer to step 2.A.(8) for instructions. TABLE 1 NOTES (Continued)Issued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 8 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

FIGURE 1 REMOVE MATERIAL 1.10

1.00

MODIFIED 1 1/4” 12-POINT SOCKETIssued: June 6, 2013 Revised: October 23, 2013 CC7-27-026 R2 Page 9 of 9 

# SERVICE BULLETIN SA227 SERIES COMMUTER CATEGORY

6M271001201 FWD 

# A A

BEARING

REAR SUPPORT

SPACER (P/N 26-71007-003) SHAFT WOODRUFF KEY RETAINING NUT CONTROL WHEEL

BEARING FRONT SUPPORT

SPACER (P/N 26-71007-001) SPACERS A/R (P/N 26-71004-095); UP TO 10 REQUIRED

CHAIN AND SPROCKET WOODRUFF KEY SLOT

CONTROL COLUMN KEEPER

CABLE MASTER LINK

FIGURE 2 CONTROL WHEEL ASSEMBLYP.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421

### SERVICE BULLETIN COMPLIANCE FORM

CC7-27-026 R2

TO: OPERATOR OR SERVICE FACILITY ACCOMPLISHING BULLETIN Please complete this compliance form, and mail according to the instructions on the reverse side.
Thank you for returning this form.

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Bulletin Issue Date Revision Date
Aircraft Registration Number
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Time on Aircraft
Date Accomplished

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