### Service Bulletin

27 March 2015 

# 340–30–094

Page 1 of 3 

### ATA CHAPTER: 30 ICE AND RAIN PROTECTION – AIRFOIL DE–ICING SYSTEM – INSPECTION OF THE DE–ICER BOOTS ON THE HORIZONTAL STABILIZER Mod No. –

1. PLANNING INFORMATION
A. EFFECTIVITY (1) Aircraft: Aircraft Mfg. Serial No’s SAAB SF340A – 004 thru – 159. Aircraft Mfg. Serial No’s SAAB 340B – 160 thru – 459. NOTE : FOR A/C 004–138, this Service Bulletin is only applicable for aircraft POST SB 340–55–008 (Mod 1462) and PRE SB 340–55–010 (Mod 1793). (2) Spares: Not affected.
B. REASON There have been some reported events of ruptured horizontal stabilizer de–icer boot. In–flight rupture of a de–icer boot will result in complete loss of the de–icing function within its associated zone. In some of the reported events of ruptured horizontal stabilizer de–icer boot, the de–icer boot has formed a large open scoop with experienced vibrations and impaired flying qualities as a consequence. To reduce the risk of horizontal stabilizer de–icer boot rupture, a onetime inspection and repetitive detailed inspections are introduced in accordance with this Service Bulletin until a corrective action has been defined.
C. DESCRIPTION This Service Bulletin gives instructions for: – Detailed inspection of the de–icer boots installed on the horizontal stabilizers – Repair and/or replacement of damaged de–icer boots.
D. COMPLIANCE Mandatory. Saab recommends this Service Bulletin to be performed within 600 FH or 6 months whichever occurs first from release date of this Service Bulletin and then repetitive every 400 FH until terminating action is implemented. This Service Bulletin is under EASA consideration for an Airworthiness Directive. The final compliance terms will be set by the EASA Airworthiness Directive (AD) when issued.
E. APPROVAL This Service Bulletin is developed and approved under the authority of DOA nr. EASA.21J.066.

### Service Bulletin

27 March 2015 

# 340–30–094

Page 2 of 3 F. MANPOWER Estimated time to complete this Service Bulletin is: 2 persons required. Total manhours: 3 Elapsed time (hours): 6 Labour cost at operators expense.

G. MATERIAL – COST AND AVAILABILITY Local supply.

H. TOOLING (1) Access platform or equivalent. (2) Warning sign: – ”DO NOT START OR TURN THE LH ENGINE” – ”DO NOT START OR TURN THE RH ENGINE”.
I. WEIGHT AND BALANCE None.

J. ELECTRICAL LOAD DATA Not affected.

K. REFERENCES Aircraft Maintenance Manual (AMM) 30–10–35–06, Inspection/Check Aircraft Maintenance Manual (AMM) 30–10–35–08, Repair. NOTE : Make sure that the revision dated Dec 01/14 or later of the above AMM references are used during the inspection and/or repair.

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) In the flight compartment, put up the warning signs: – ”DO NOT START OR TURN THE LH ENGINE” – ”DO NOT START OR TURN THE RH ENGINE”. (3) Install the access platform.

### Service Bulletin

27 March 2015 

# 340–30–094

Page 3 of 3 B. INSPECTION NOTE : Make sure that the revision dated Dec 01/14 or later of the AMM is used during the inspection and/or repair. (1) Do a detailed inspection of the de–icer boots installed on the LH and RH leading edge of the horizontal stabilizer (part of MRBR Task 301001) for damages, Ref. AMM 30–10–35–06, Inspection/Check. (a) Make sure that the de–icer boots are in serviceable condition and possible damages within specified limits. (b) Make sure that already made repairs are within specified limits, Ref. AMM 30–10–35–08, Repairs. (c) If necessary, make necessary repairs or replace the de–icer boot, Ref. AMM 30–10–35–08, Repairs. (2) Repeat the detailed inspection every 400 FH until future terminating action is implemented.
C. JOB CLOSE–UP (1) Remove all the tools and equipment from the work area. Make sure the work area is clean. (2) Remove the access platform. (3) From the flight compartment, remove the warning signs: – ”DO NOT START OR TURN THE LH ENGINE” – ”DO NOT START OR TURN THE RH ENGINE”.
3. MATERIAL INFORMATION Not Applicable