# Service Bulletin

22 November 2011 

# 2000–53–057

Page 1 of 7 

# ATA CHAPTER: 53 FUSELAGE – CENTER BOTTOM PANEL – INSPECTION FOR CHAFING

Mod No. –

1. PLANNING INFORMATION

A. EFFECTIVITY (1) Aircraft: Aircraft Mfg. Serial No’s SAAB 2000 – 004 thru – 063. (2) Spares: Not affected.

B. REASON Two aircraft have been found with chafing to the bottom panel of the center cabin between STA 562 and 622. The chafing is caused by Hi Loks installed, as a repair during production, through the upper wing skin panel.

C. DESCRIPTION This Service Bulletin gives instructions for: – General visual inspection of the area between the upper part of the wing skin and the center bottom panel to verify if there are Hi Loks installed – Send a report to Saab after inspection (irrespectively of finding).

D. COMPLIANCE Mandatory. To be performed within 12 month from release of this Service Bulletin.

This Service Bulletin is under EASA consideration for an Airworthiness Directive. The final compliance terms will be set by the EASA Airworthiness Directive when issued.

E. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA nr. EASA.21J.066.

F. MANPOWER Estimated time to complete this Service Bulletin is:
1 persons required.

Total manhours: 4 Elapsed time (hours): 4

NOTE : Estimated time is for inspection only.
Labour cost at operators expense.

G. MATERIAL – COST AND AVAILABILITY Local supply.

# Service Bulletin

22 November 2011 

# 2000–53–057

Page 2 of 7 H. TOOLING Warning sign ”DO NOT OPERATE THE FLIGHT CONTROLS”.

I. WEIGHT AND BALANCE

None.

J. ELECTRICAL LOAD DATA

Not affected.

K. REFERENCES

Aircraft Maintenance Manual (AMM) 06–41–00
53–20–10–000–801
53–20–10–400–801 Structural Repair Manual (SRM) 51–33–00 Corrosion Preventive Manual (CPM) 20–20–60

L. OTHER PUBLICATIONS AFFECTED

Not affected.

2. ACCOMPLISHMENT INSTRUCTIONS

A. JOB SET–UP (1) Before you start the SB, make sure: – The local supply items listed in the Service Bulletin are available – The documentation is available. (2) Put up the warning sign ”DO NOT OPERATE THE FLIGHT CONTROLS” in the flight compartment. (3) Get access to the inspection area (a) Open the access panels (Ref. AMM 06–41–00):
– 191DB – 191EB – 192EB – 191FB – 191GB – 192FB.

# Service Bulletin

22 November 2011 

# 2000–53–057

Page 3 of 7 B. INSPECTION REF. FIG. 1, 2

NOTE : General visual inspection, definition: A visual examination that will detect obvious unsatisfactory conditions/discrepancies. This type of inspection may require removal of fillets, fairings, access panels/doors, etc. Work stands, ladders, etc. may be required to gain proximity. (1) Use a strong light source and do a general visual inspection of the area between the lower part of the center fuselage and the upper part of the wing skin. Inspect the area between: – STA 562.5 and STA 622.7 – BL 40.300 and RBL 40.300. (a) If there is no Hi Lok installed with the nut on the outside (upper surface of the wing), report no findings to Saab and then continue with Para C., Job Close–Up.

Contact information: Aircraft Services Division Saab AB Support and Services E–mail: Saab2000.techsupport@saabgroup.com Fax: +46 (0) 13 18 48 74 (b) If there is any Hi Lok installed with the nut on the outside, continue with step (c). (c) Measure the distance between the fastener and the bottom panel, refer to detail view in figure. 1.

1 If the distance is more than 15 mm (0.59 in): – Make a record of the Hi Lok locations and send the report to Saab (REF. FIG 2). No further action is required. – Continue with Para C. (Job Close–Up).
2 If the distance is less than 15 mm (0.59 in):

a Use boroscope equipment or equivalent and inspect the bottom panel for chafing or damages caused by the Hi Loks. – If there is no visible chafing or damage on the bottom panel, make a record of the Hi Lok locations and contact Saab (REF. FIG 2). – If there is any visible chafing on the bottom panel, continue with step b thru e.
b In the passenger area, between STA 562 and 622, remove the floor panels (Ref. AMM 53–20–10–000–801):
– 151AZ – 151BZ – 151CZ – 151DZ – 151EZ (A/C 051 and 054 only) – 151FZ (A/C 051 and 054 only) – 152AZ – 152BZ – 152CZ (A/C 025, 040, 045 and 049 only) – 152DZ (A/C 025, 040, 045 and 049 only) – 152EZ (A/C 025, 040, 045 and 049 only) – 152FZ (A/C 025, 040, 045 and 049 only).

c Carefully lift and remove the insulation pads that are installed in the bottom of the fuselage between STA 562 and 622.

d Inspect the inside of the bottom panel for any sign of damage.

e Make a record of the Hi Lok locations and the findings and contact Saab for a corrective action (REF. FIG. 2).

# Service Bulletin

22 November 2011 

# 2000–53–057

Page 4 of 7 C. JOB CLOSE–UP (1) Remove all the tools and equipment from the work area. Make sure the work area is clean. (2) If removed, apply new corrosion inhibiting compound to the surfaces (Ref. CPM 20–20–60). (3) Close the access (a) Close the access panels (Ref. AMM 06–41–00):
– 191DB – 191EB – 192EB – 191FB – 191GB – 192FB. (b) If removed, install the floor panels (Ref. AMM 53–20–10–400–801):
– 151AZ – 151BZ – 151CZ – 151DZ – 151EZ (A/C 051 and 054 only) – 151FZ (A/C 051 and 054 only) – 152AZ – 152BZ – 152CZ (A/C 025, 040, 045 and 049 only) – 152DZ (A/C 025, 040, 045 and 049 only) – 152EZ (A/C 025, 040, 045 and 049 only) – 152FZ (A/C 025, 040, 045 and 049 only) (4) Remove the warning sign ”DO NOT OPERATE THE FLIGHT CONTROLS” from the flight compartment.

3. MATERIAL INFORMATION

A. Local supply

Item Part Number Qty Nomenclature Designation Remarks
– Dinitrol AV 25 AR Corrosion inhibiting compound Bottom paneland upper surface of wing Ref. CPM 20–20–60

NOTE : Equivalent materials can be used for listed items, Ref. SRM 51–33–00.Service Bulletin22 November 20112000–53–057Page 5/6 of 7AREA BETWEEN THE WING SURFACEAND THE BOTTOM PANEL OF THECENTER FUSELAGE TO BE INSPECTEDINSPECTINSPECTB18635VIEW LOOKING FWDCLEARANCETYPICAL VIEW (IF REPAIR IS PERFORMED)BOTTOM PANELWING SURFACEFASTENERWING SURFACEFUSELAGEInspection of Fuselage bottom Panel for ChafingFIG. 1

# Service Bulletin

Date Month Year

Revison X, Date Month Year 

# 2000–XX–XXX

Page 6

# Service Bulletin

22 November 2011 

# 2000–53–057

Page 7 of 7 B18636 

# VIEW FROM ABOVE

MARK OUT THE POSITION OF HILOKS. SEND REPORT TO: E–MAIL: Saab2000.techsupport@saabgroup.com FAX: +46(0)13184874

Inspection Report FIG. 2