AEROTECHNIK CZ s.r.0. Tel.: +420 632 537 11 1 

686 04 Kunovice Fax: +420 632 537 900 

Czech Republic e-mail : aerotechnik@evektor.cz 

issues 

MANDATORY BULLETIN E.SW 13 - 048a 

SEH 13 - 005a 

SL 13-004a 

The technical aspect approved by TI-CAA of the Czech Republic Date: November 22,1999 

1. REFER TO : 

2. REASON : 

3. REQUIRED ACTION : 

All powered sailplanes No. L 13SW, L 13SE, L 13SEH, L 13SDM, 

L 13SL, L 13SDL. 

On the L 13SW powered sailplane S/N 890319, the fin spar-fuselage 

hinge (Dwg./No. A102 021 N) made of 424253.1 1 material has been 

damaged during operation. The material of this component must be 

tested as instructed in this Bulletin. 

Perform the hinge material inspection. 

4. LATEST DATE OF THE ACTION: After receiving this bulletin, not later than 3 1.12.1999. 

5. ACTION CARRIED OUT BY : Operator. 

6. INDUCED COST COVERED : Operator. 

7. NECESSARY MATERIAL : --- 

8. PROCESS: See Appendix 

9. ENCLOSURE: 4 sheets 

686 04 KUNOVICE 

tel.: 06321537 11 1. fax: 537 900 

dg. Josef Hron 

....................................... 

On behalf of Manufacturer 

Date: November 18. 1999 

Page : 111 Number of Appendices: 4 
1 A. W"RK PROCEDURE 

.Appendix 

I I. Remove the cover located on the LH side of the fuselage, under the horizontal stabilizer. 

i 

I 

i 

1 2. Test the material of the attachment fitting P/N A 102 021N as follows: 

1 

, a) Conductivity measurement by means of eddy currents: 

I 

1 - Reco~n~nended measurement frequency: 60 kHz 

I - Probe diameter: not exceeding 0 15 mm 

- Measuring contact point: 

I lower milled surface of the component, between the rivets (see Figs 1 and 2) 

1 

MANDATORY BULLETIN 

C. SW 13 - 048a, SEH 13 - 005a, SL 13 - 004a 

1 Permissible range of lneasrlred values: 

I 

I % IACS MS/m 

i 28.5 -35.0 15.0 - 20.0 

I Note: The surface protective coating of the component need not be removed. 

i 

sheet: 

1 

b) Hardness measurement by means of a portable digital hardness tester. 

Measuring method: depending on the type of the hardness tester used, i.e. dynamic, 

ultrasonic, and/or by means of a manual probe. 

Measuring point: lower milled surface of the component 

Measured value: not lower than 100 HB 

o fi 

4 

c) Any otliel- measuring method must be approved by the sailplane manufacturer before 

I it can be used. I 

If the values measured during the check are within the permissible limits specified above, make a 

record in the powered sailplane log book (see section H of this Bulletin). The powered sailplane 

operation can be continued without any limitations. 

2. 

/ If the values measured during the check are not within the permissible limits, the attachment fitting 

, 

PIN A 102 02 1N must be replaced before the powered sailplane operation can be continued. 

I 

4. If the attachment fitting P/N A 102 021N is to be replaced, the operator shall place an order with 

ma~~ufacturer, stating the powered sailplane Serial No. number of flight hours, registration mark, 

and number of its repairs and/or overhauls. 

I 

1 5. The manufacturer will send to the operator the material required for replacement, together with a 

/ bulletin providing the work procedure. 

i 

0 After the check, reinstall the inspection hole cover. 

B. MATERIAL REQUIRED FOR MODIFICATION OF ONE SAILPLANE 
MANDATORY BULLETIN Sheet: of 

MOTECHNIK 

 a -- E. SW 13 - 048a, SEH 13 - 005a, SL 13 - 004a 2 4 

1 C. ILLUSTRATIONS 

I Figs 1 and 2. 

I D. DOCUMENTATION REQUIRED 

1 None. 

I 

I 

I ' E. TOOLS REQUIRED i 

Mater-ial hardness testing equipment: 

- Eddy cun-ent conductivity meter 

- Hard~iess tester 

F. SPARE PARTS IN OPERATION 

I The spare pasts in stock, if any, inust be tested as instructed in Section A, item 2 of this Bulletin. 

G. SAILPLANE MASS 

Not affected. 

H. RECORD IN LOGBOOK AFTER BULLETIN IMPLEMENTATION 

SW 13-048a. SEH 13-005a. SL 13-004a (according to the powered sailplane type) 

Attachment fitting PIN A 102 021 N material hardness tested. 

Mcasul-cd values: 

Powcred sailplane cleared for operation. 

1 Date: ...................................................... Canied out by: ................................ ..... ..................... 

I (legible signature of authorized engineer) 

I. ACCOMPANYING DOCUMENTATION 

1 Not affected. 

1 CONTACT ADDRESS: 

Ael-otechnik CZ, s.r.0. 

Ailport 

686 04 Kunovice 

Czech Republic 

Tel. 06321537 317,06321 537 533 fax: 06321537 900 
r@-- MANDATORY BULLETIP 

- . . 13 - 018a, SEH 13 - 005a, SL 1 

Fig. 1