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Service Bulletin 22 December 2020
340ï33ï062 Page 1 of 4 ATA CHAPTER: 33 LIGHTS ï EMERGENCY LIGHTING ï CHANGE OF CIRCUIT BREAKER 2LN ï EMER
LT/CABIN & EXT/CTL Mod No. 3691
1. PLANNING INFORMATION A. EFFECTIVITY
(1) Aircraft:
Aircraft Mfg. Serial No’s SAAB 340B ï 342, 359ï459.
(2) Spares: Not affected.
B. REASON The circuit breaker for the emergency cabin lighting 2LN, in position L8, has been reported tripped without fault in the system. The following investigation found that the circuit breaker 2LN has a too low rating (5A) during max charging conditions.
A tripped circuit breaker can result in insufficient charged emergency battery.
In order to eliminate the tripping, without any fault in the system, this Service Bulletin will change the circuit breaker rating from the existing 5A to 7.5A.
Implementation of this Service Bulletin will eliminate the possibility for incorrectly tripped circuit breaker and thus, insufficient charged emergency battery and ultimately loss of the emergency light in the cabin.
C. DESCRIPTION This Service Bulletin gives instructions for:
ï Removal of the existing 5A circuit breaker ï Installation of the new 7.5A circuit breaker.
D. COMPLIANCE Mandatory.
Saab recommends this Service Bulletin to be performed within 6 months or 1000 FH whichever occurs first 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 (AD) when issued.
E. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA ref.
EASA.21J.066.
F. MANPOWER Estimated time to complete this Service Bulletin is:
1 persons required.
Total manhours: 1
Service Bulletin 22 December 2020
340ï33ï062 Page 2 of 4 Elapsed time (hours): 1 Labour cost at operators expense.
G. MATERIAL ï COST AND AVAILABILITY Price and availability for parts required to do this service bulletin will be furnished on request.
H. TOOLING No special tooling required.
I. WEIGHT AND BALANCE None.
J. ELECTRICAL LOAD DATA Not affected.
K. REFERENCES Aircraft Maintenance Manual (AMM) 39 ï10ï42ï02 L. OTHER PUBLICATIONS AFFECTED Illustrated Parts Catalog (IPC) Wiring Manual (WM)
2. ACCOMPLISHMENT INSTRUCTIONS REF. FIG. 1 A. JOB SET ïUP
(1) Before you start the SB, make sure:
ï The part listed in the Service Bulletin is available ï The documentation is available.
B. REMOVAL
(1) At the RH circuit breaker panel 10VU, position L ï8, remove the 5A circuit breaker (R01) EMER LT/EXT/CABIN or EMER LT/CABIN & EXT/CTL (2LN), Ref. AMM 39ï10ï42ï02.
C. INSTALLATION
(1) At the RH circuit breaker panel 10VU, position Lï8, install the new 7.5A circuit breaker (01) EMER LT/EXT/CABIN or EMER LT/CABIN & EXT/CTL (2LN), Ref. AMM 39ï10ï42ï02.
D. JOB CLOSE ïUP
(1) Remove all the tools and equipment from the work area. Make sure the work area is clean.
3. MATERIAL INFORMATION A. Parts required for modification:
Item Part Number Qty Nomenclature Designation Remarks 01 MS3320 ï7.5 Alt.
483ï96ïTCï K14ï7.5 1 Circuit Breaker 10VU (L ï8) 7.5 A
Service Bulletin 22 December 2020
340ï33ï062 Page 3 of 4 B. Removal Item Part Number Qty Nomenclature Designation Remarks R01 MS3320 ï5 Alt.
483ï96ïTCïK14ï5 1 Circuit Breaker 10VU (L ï8) 5 A
Service Bulletin 22 December 2020
340ï33ï062 Page 4 of 4 Change of Circuit Breaker 2LN ï Emergency Light FIG. 1 A34890