AEROTECHNIK CZ s.r.0. Tel.:+420 632 537 111 686 04 Kunovice Fax:+420 632 537 900 Czech Republic e-mail : aerotechnik@evektor.cz 

### issues 

## MANDATORYBULLETIN 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 13SWpowered sailplane S/N 890319, the fin spar-fuselage hinge (Dwg./No.A102 021 N) made of 424253.11 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 OFTHE ACTION: After receiving this bulletin, not later than 31.12.1999. 5. ACTION CARRIED OUTBY : Operator. 6. INDUCED COST COVERED : Operator. 7. NECESSARY MATERIAL : --- 8. PROCESS: See Appendix 9. ENCLOSURE: 4 sheets

686 04 KUNOVICE tel.: 06321537 111. fax:537 900 dg.Josef Hron



### ....................................... On behalf ofManufacturer 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 sideof the fuselage, under the horizontal stabilizer. 

### iI i



# 1 2. Test the material of the attachment fitting 

### P/N A 102021N 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 15mm - 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 ofthe 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 ofthe 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 

### ofi 4

c) Any otliel-measuring method must be approved by the sailplane manufacturer before I it can be used. I 

### Ifthe 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). Thepowered 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 bereplaced, 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 OFONE 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-ialhardness 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-cdvalues: 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 317,06321537 533 fax: 06321537 900

### MANDATORYBULLETIP 

# r@--
- . . 13 

### -018a, SEH 13 

### -005a, SL 1 Fig. 1