P.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421

TO: HOLDERS OF SA26 SERIES SERVICE INFORMATION MANUALS

Attached is Revision 2 to SA26 Series Service Bulletin 26-27-001, 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 deletes step 1.D.(2)(d). It revises steps 1.D.(3). and 1.D.(3)(c). Step 1.D.(3)(d)1)

is revised to include "not to exceed 24 calendar months from the date of this

bulletin" statement. It revises step 1.D.(4) and adds steps 1.D.(4)(a) and 1.D.(5).

It revises Note 1 and adds Note 2 to step 1.D. It revises steps 2.A.(3), 2.A.(4), and

2.A.(5)(b).

Please insert the attached revised Chapter 27 Index pages.
P.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421
CHAPTER 27 – FLIGHT CONTROLS

Issued: June 06, 2013

Revised: October 23, 2013

CHAPTER 27 INDEX

Page 1 of 1

NUMBER DATE TITLE AIRCRAFT EFFECTIVITY

SA26 SERIES INDEX

26-27-001 06-06-13 Inspection and Lubrication of All SA26-T/AT Series

(R) 09-30-13 the Aileron Control Cable Chain Airplanes

(R) 10-23-13 in the Pilot's and Copilot's

Control Columns
P.O. Box 790490 • San Antonio, Texas 78279–0490 • (210) 824–9421
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 1 of 8

SERVICE BULLETIN

SA26 SERIES

Flight Controls

Inspection and Lubrication of the Aileron Control Cable Chain in the Pilot's and

Copilot's Control Columns

1. PLANNING INFORMATION

A. Effectivity:

All SA26-T, S/N T26-2 thru T26-99

All SA26-AT, S/N AT26-100 thru AT26-180E

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 The chains had never been replaced by the operator since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 deletes step 1.D.(2)(d). It revises steps 1.D.(3). and 1.D.(3)(c). Step 1.D.(3)(d)1) is

revised to include "not to exceed 24 calendar months from the date of this bulletin"

statement. It revises step 1.D.(4) and adds steps 1.D.(4)(a) and 1.D.(5). It revises Note

1 and adds Note 2 to step 1.D. It revises steps 2.A.(3), 2.A.(4), and 2.A.(5)(b).

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 each

control column. Ensure the instructions for chain/sprocket lubrication during replacement is performed to prevent jamming. Lubricate chain and sprocket upon replacement.

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 and

lubrication (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

26-27-001 R2

Page 2 of 8

SERVICE BULLETIN

SA26 SERIES

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) (b), and (c) 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 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) See step 2 for accomplishment instructions.
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 3 of 8

SERVICE BULLETIN

SA26 SERIES

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. 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.

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:

SA26 Maintenance Manual.

M-5585 - M7 Aerospace Memorandum Aileron Control Chain Service Difficulty Report

(SDR).

NOTE: References are for manufacturers’ use only.
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 4 of 8

SERVICE BULLETIN

SA26 SERIES

K. Other Publications Affected:

SA26 Maintenance Manual.

SA26 Illustrated Parts Catalog

2. ACCOMPLISHMENT INSTRUCTIONS

A. For replacement of any or all chains, sprocket, and bearings in control columns,

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 SA26 Maintenance

Manual, Section 2 for floorboard details. Retain all hardware for reinstallation of same.

(1) Remove the lower access panel on the pilot's side control column only (which gives access to the cable turnbuckle). Refer to SA26 Illustrated Parts Catalog (IPC),

Section VII, Figure 45 for details. Retain all hardware.

(2) Follow the guidelines per SA26 Maintenance Manual, Supplement B to Section 3, for control wheel disassembly (ref Supplement B to Section 3, Figure 201 for 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.

(3) Replace the sprocket and bearings with those contained in Kit 26K71004-001 per

Table 1. The bearings are located in the front and rear supports (26-71009-001) in the

control wheel assembly. Visually inspect the removed sprocket and existing chain

with 10X magnification and good light for chips, gouges, damaged rollers, missing

teeth, peeling metal, and signs of abnormal wear.

(4) Replace the chain.

(5) Lubricate control wheel chain with Table 1 lubricant (by hand) per SA26 Maintenance

Manual, Section 2.

(a) The instructions for lubrication shall follow this bulletin and NOT apply the

Corrosion Preventative (CP) to the chain.

NOTE: The CP IS applicable 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.
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 5 of 8

SERVICE BULLETIN

SA26 SERIES

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.

(6) Ensure all other parts of the control wheel assembly are fit for service. (See Figure 2

for parts)

(7) Restore the control wheel assembly to operating condition per SA26 Supplement B

to Section 3.

(8) Reinstall all access panel on the control column removed in step 2.A.(1).

(9) Perform aileron control cable tension and rigging checks per SA26 Maintenance

Manual, Section 3, Page 3-12.

(10) Reinstall all components, structure, and hardware per applicable sections of the

SA26 Maintenance Manual.

(11) Complete aircraft records in accordance with 14 CFR 43.9.

(12) Complete and return service bulletin Compliance Form to M7 Aerospace Technical

Publications Department at MetroTech@M7Aerospace.com.
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 6 of 8

SERVICE BULLETIN

SA26 SERIES

3. MATERIAL LISTING

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.

*** MIL-PRF-81322 supercedes MIL-G-81322 however, MIL-G-81322 is still a valid grease to

use in this application.

****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

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Table 1 Notes continued on next page.

TABLE 1
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 7 of 8

SERVICE BULLETIN

SA26 SERIES

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.(7)

for instructions.

TABLE 1 NOTES (CONTINUED)

FIGURE 1

REMOVE

MATERIAL 1.10

1.00

MODIFIED

1 1/4” 12-POINT SOCKET 
Issued: June 6, 2013

Revised: October 23, 2013

26-27-001 R2

Page 8 of 8

SERVICE BULLETIN

SA26 SERIES

FIGURE 2

CONTROL WHEEL ASSEMBLY

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
SERVICE BULLETIN COMPLIANCE FORM

26-27-001 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.

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Aircraft Model Aircraft Serial Number

Bulletin Issue Date Revision Date

Aircraft Registration Number

Operator/Owner

Time on Aircraft

Date Accomplished

Comments
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