ISSUE : 5 of 19/03/2004 SB N° : 90-25-012

DATE : 18/01/2001 PAGE : 1 / 10

SB – Form CE 025 – 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$;

# 	


SERVICE BULLETIN

N° 90-25-012

ATA system: 25

SUBJECT:



## PASSENGER SEAT ASSEMBLIES

BACKREST LINKS

ROUTINE INSPECTION

Q. GOVINDAPOULLE F. PORTALIER G. OKON

Technical Support Eng. Customer Services Airworthiness Mgr.

Service Bulletin approved by SICMA AERO SEAT in accordance with IR 21A603(b) & IR 21A611(a)

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 2 / 10

SB – Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

## 1/ PLANNING INFORMATION

A - EFFECTIVITY

This Service Bulletin is applicable to SICMA seat series 9140, 9166, 9173, 9174, 9184, 9188, 9196, 91B7, 91B8, 91C0, 91C2, 91C3, 91C4, 91C5, 9301, 9501, equipped with backrest links P/N
90-000200-104-1 and 90-000200-104-2. See the affected seat P/Ns list on attached ANNEX 1
issue 2 of this SB90-25-012 and its revisions

.

B - REASON

After some time in-service some cracks have been found on backrest links P/N 90-000200-104-1 & 90-000200-104-2 and will adversely affect the structural resistance of the backrest structure. To prevent this situation from occurring SICMA has issued a checking and replacement procedure
as a routine maintenance.

C - DESCRIPTION

The instructions of this document contain the following steps :

1. INTERMEDIATE INSPECTION : to ensure existing links are in good condition and not cracked. This check must be performed before 6000 seat operating hours since new or since last backrest links installation or before 2 years from seat manufacturing date, whichever
occurs later.

On seats which are already over 6000 operating hours or over 2 years from seat manufacturing date, a period of 900 extra seat operating hours without exceeding 5 months is granted from the issuing date of the Airworthiness Directive ref. 2001-605 (AB), whichever occurs later, to complete the backrest links inspection.

2. ROUTINE REPLACEMENT : to change the existing links P/N 90-000200-104-1 and 90- 000200-104-2 with new ones. This replacement must be performed before 12000 seat operating hours since new or since last backrest links installation or before 4 years from seat manufacturing date, whichever occurs later.

On seats which are already over 12000 operating hours or over 4 years from seat manufacturing date, a period of 3500 extra seat operating hours without exceeding 18 months is granted from the issuing date of the Airworthiness Directive ref. 2001-605 (AB), whichever occurs later, to complete the backrest links replacement. During this period of 3500 extra seat operating hours without exceeding 18 months from the issuing date of the Airworthiness Directive ref. 2001-605 (AB), the backrest links will have to be checked for proper conditions every 900 operating hours without exceeding 5 months from the issuing date of the Airworthiness Directive ref. 2001-605 (AB), whichever occurs later.

The application of this Service Bulletin SB90-25-012 involves the addition of the modification placard P/N 00-6414 on each modified backrest structure indicating that the SB90-25-012 and its
revisions - Part 2 has been completed (see § IDENTIFICATION of this S/B).

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 3 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; D - COMPLIANCE

The application of this Service Bulletin is mandatory in accordance with the Airworthiness Directive (AD) ref. 2001-605 (AB).

E - APPROVAL

Service Bulletin approved by SICMA AERO SEAT in accordance with IR 21A603(b) & IR 21A611(a)

F - MANPOWER

Estimated time : 1 Min. per backrest inspection Estimated time : 40 Min. per backrest links change

G - MATERIAL

– Cost and availability

The necessary parts will be supplied by :

SICMA AERO SEAT Spare parts department 7, Rue Lucien Coupet
36100 ISSOUDUN

– France Tel.: 33 (0) 2 54 03 39 39 - Fax: 33 (0) 2 54 03 39 00

Availability : 30 days upon receipt of request. Cost : See Chapter 3 « Material information »

.

H - TOOLING and MATERIAL

– Cost and availability

No special tooling is required

I - WEIGHT and BALANCE

Not affected

J - ELECTRICAL DATA

Not affected

K - REFERENCES

N/A

L - OTHER PUBLICATIONS AFFECTED

Component Maintenance Manuals

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 4 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

## PART ONE : CHECKING PROCEDURE

INTERMEDIATE INSPECTION :



## Required before 6000 seat operating hours since new or since last backrest links installation or before 2 years from seat manufacturing date on the issuing date of the AD ref. 2001-605 (AB), whichever
occurs later.

## For affected seats having more than 12000 seat operating hours or more than 4 years from seat manufacturing date on the issuing date of the AD ref. 2001-605 (AB), whichever occurs later : The intermediate inspection is required every 900 seat operating hours or every 5 months without exceeding 3500 seat operating hours or 18 months on the issuing date of the AD ref. 2001-605 (AB),
whichever occurs later.



### ACCOMPLISHMENT INSTRUCTIONS :

1. On each backrest assy, pull up the low corner of the backrest cushion in order to gain access to the backrest links see figure 1.

2. Perform a visual inspection on the backrest links in order to check if there is any crack and especially at the location shown on figure 2. A flash-light can be used.

3. According to findings perform the following appropriate action (see figure 2) :

FINDINGS ACTION

The links are not cracked The links are serviceable and can be left in-service until the 12000 seat operating hours since new or since

last backrest links installation or before 2 years from

seat manufacturing date, whichever occurs later

The link(s) has (have) crack stopped at the lock-out pin-hole (*) The links have a limited life span and will have to be replaced within 600 operating hours without exceeding 3 months, whichever occurs later

The link(s) has (have) crack which passed the lock-out pin-hole (*) The links are not serviceable and must be immediately replaced

(*) refer to Removal Procedure in Part Two of this Service bulletin

NOTE : In order to keep the same service life of the links assembly, both links P/N 90-000200- 104-1 and 90-000200-104-2 have to be replaced in same time.



### IDENTIFICATION (see figure 4 ) :

1. Add or complete the placard P/N 00-6414 on each checked backrest to indicate that the Service
Bulletin SB90-25-012 and its revisions

– Part 1 has been completed.

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 5 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; NOTE: The placard P/N 00-6414 should be installed onto the backrest structure sheet-aluminum (see figure 1). 

## PART TWO : REPLACEMENT PROCEDURE

ROUTINE REPLACEMENT :

Required before 12000 operating hours since new or since last backrest links installation or before 4 years from seat manufacturing date or in case of cracked link on the issuing date of the AD ref. 2001- 605 (AB), whichever occurs later.



### ACCOMPLISHMENT INSTRUCTIONS :

1. On each backrest assy, pull up the low corner of the backrest cushion in order to gain access to the
backrest links.

2. Disconnect the hydrolock from the backrest link (item 1, figure 3) to allow the backrest to be folded forwards. Make sure to not damage the kick-panel with this link while pulling forwards the backrest.

3. Remove the two backrest hinge bolts in order to reach easily the links attachment.

4. Remove the bolt P/N AN410A, nut P/N NAS679A4, washers P/N 56-06-26-32 and friction washers P/N 502-20-500-02 (items 2, figure 3) from the hydrolock link.

5. On some seats, a backrest breakover shaft or lock-out pip-pin has to be removed from the lock out pin hole on the links.

6. Remove the backrest hinge spacer (item 3, figure 3) and the upper attachment bolt P/N AN3-7A and nut P/N NAS679A3 (item 4, figure 3) from the backrest structure.

7. Disengage the two links P/N 90-000200-104-1 and 90-000200-104-2 and the spacer P/N 90-000200-
112-0 from the backrest structure.

8. Install new links P/N 90-000200-104-1 and 90-000200-104-2 with the existing spacer P/N 90- 000200-112-0 into backrest structure by using the bolt P/N AN3-7A and nut P/N NAS679A3.

9. Reverse the above steps 5 to 2 and restore the seat to normal condition.



### IDENTIFICATION (see figure 4) :

1. Add or complete the placard P/N 00-6414 on each modified backrest to indicate that the Service
Bulletin SB90-25-012 and its revisions

– Part 2 has been completed.

NOTE: The placard P/N 00-6414 should be installed onto the backrest structure sheet-aluminum (see figure 1)

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 6 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

### BACKREST STRUCTURE ASSEMBLY EQUIPPED WITH LINKS

- FIGURE 1 - LINKS LOCATION BOLT P/N AN3-7 A SPACER P/N 90-000200-112-0
NUT P/N NAS679A3 MODIFICATION PLACARD
P/N 00-6414
LOCATION FOR STICKING

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 7 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

### BACKREST LINK INSPECTION

- FIGURE 2 - Backrest link in good condition Backrest link with crack stopped at the
hole Backrest link with crack which passed
the hole



### SERVICEABLE PART

CAN BE LEFT
IN- SERVICE LIMITED LIFE SPAN
LINK TO BE REPLACED WITHIN 600
SEAT OPERATING
HOURS WITHOUT
EXCEEDING 3 MONTHS UNSERVICEABLE
PART

MUST BE REPLACED

IMMEDIATELY

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 8 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

### LINKS REMOVAL PROCEDURE

- FIGURE 3 - LINK BETWEEN
BACKREST AND

HYDROLOCK ATTACHMENT BOLT-NUT
AND SPACER TO BE
REMOVED

BACKREST HINGE SPACER
TO BE REMOVED

BOLT – WASHERS –

FRICTION WASHERS – NUT

TO BE REMOVED 

### 4

3

2

1

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 9 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; MODIFICATION PLACARD P/N 00-6414

TO BE INSTALLED ONTO THE BACKREST STRUCTURE SHEET-ALUMINUM

- FIGURE 4 -

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SERVICE BULLETIN

ISSUE : 5 of 19/03/2004 SB N ° : 90-25-012

DATE : 18/01/2001 PAGE : 10 / 10

SB

– Form CE 025

– 10/93

58(/8&,(1&283(7%3,6628'81)5$1&(7(/(3+21(7(/()$; 

## 3/ MATERIAL INFORMATION

1. Parts required per the Part Two of this document (see affected seats listed on the ANNEX 1 issue
2 of this SB90-25-012 and its revisions ) :

Part Number Description Qty Notes

90-000200-104-1 Link 1 -

90-000200-104-2 Link 1 -

00-6414 Modification Placard 1 Figure 4

The prices mentioned below are valid for the dispatch year of this document. Prices
are revised each Jan. 1 st . These will then be used to respond to a request for quotation. Qty Price

SB90-25-012 KIT 1 thru 9
10 thru 24 25 and up 259,64  194,73  129,82 

2. Parts required per the Part One of this document (see affected seats listed on the ANNEX 1 issue

2 of this SB90-25-012 and its revisions ) :

Part Number Description Qty Notes

00-6414 Modification Placard 1 Figure 4

The prices mentioned below are valid for the dispatch year of this document. Prices
are revised each Jan. 1 st . These will then be used to respond to a request for quotation. Qty Price

00-6414 Modification placard 1 thru 9
10 thru 24 25 and up 7,94  6,61  5,29