EASA AD No.: 2012-0073

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2012-0073

Date: 30 April 2012

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the European Communit y, its Member States and of the European third countries that participate in the activities of EASA under Article 66 of that Regulation.

This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accordan ce with the requirements of that AD, unless otherwi se specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, A rticle 14(4) exemption]. 

### Type Approval Holder’s Name: HPH spol. s r.o. Type/Model designation(s): Glasflügel 304 CZ

TCDS Number: EASA.A.030

Foreign AD: Not applicable

Supersedure: None



### ATA 27 Flight Controls – Elevator Control Rod in the Verti cal Fin –

Inspection / Replacement

Manufacturer(s): HPH spol. s r.o.

Applicability: Glasflügel 304 CZ, Glasflügel 304 CZ-17, Glasflügel 304 C all serial numbers (s/n).

Reason: A broken elevator control rod in the vertic al fin on a Kestrel sailplane has been reported. The technical investigation revealed that water had soaked into the elevator control rod through a control bore hole and resulte d in corrosion damage. The investigation concluded that the corrosion cannot b e detected from outside the elevator control rod. This condition, if not detected and corrected, coul d lead to failure of the elevator control rod, possibly resulting in loss of control of the sailplane. To address this unsafe condition, HPH spol. s r.o. published Service Bulletins (SB) : G304CZ-06a), G304CZ17-06a), G304C-06a), prov iding instructions for elevator control rod inspection and replacement. For the reasons described above, this AD requires a ccomplishment of a onetime inspection of the elevator control rod in the vertical fin and replacement with an improved control rod if control rod without drai nage hole is used.

Effective Date: 14 May 2012EASA AD No.: 2012-0073

EASA Form 110 Page 2/2 Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: (1) For all sailplanes identified in the Applicabil ity section of this AD, except those identified in Table 1 of this AD, no later th an in 30 days after the effective date of this AD, inspect the elevator con trol rod in the vertical fin in accordance with Action 1 of HPH spol. s r.o. SB: G3 04CZ-06a); G304CZ17- 06a); G304C-06a), as applicable to sailplane model.
Table 1 Sailplane model s/n

Glasfügel 304 CZ-17 26-17, 70-17
Note: The sailplanes identified in Table 1 of this AD have already been inspected and, where necessary, corrected; only pa ragraphs (3) and (4) of this AD apply to these sailplanes. (2) If, during the inspection as required by paragr aph (1) of this AD, any discrepancy is found, before next flight, replace t he elevator control rod with an improved part in accordance with Actions 2, 3 an d 4 of HPH spol. s r.o. SB: G304CZ-06a); G304CZ17-06a); G304C-06a), as appl icable to sailplane model. (3) For all sailplanes identified in the Applicabil ity section of this AD if equipped with control rod without drainage hole, within the time specified in Table 2 of this AD, as applicable, replace the elevator contro l rod in the vertical fin with an improved part in accordance with Actions 2, 3 an d 4 of HPH spol. s r.o. SB: G304CZ-06a); G304CZ17-06a); G304C-06a), as appl icable to sailplane model.
Table 2
Sailplane configuration Compliance time
Equipped with a rubber bellows on the top of the vertical stabilizer Within 8 months after the effective date of this AD
Not equipped with a rubber bellows on the top of the vertical stabilizer Within 20 months after the effective date of this AD
(4) After replacement of the elevator control rod i n the vertical fin on a sailplane, as required by paragraph (2) or (3) of this AD, as applicable, do not install an elevator control rod without a drainage hole on that sailplane.

Ref. Publications: HPH spol. s r.o. SB: G304CZ-06a); G304CZ17-06a); G3 04C-06a), dated 23.04.2012.

Remarks: 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. The required actions and the risk allowance have granted the issuance of a Final AD with Request for Comments, postponing the public consultation process after publication. 3. Enquiries regarding this AD should be referred t o the Safety Information Section, Executive Directorate, EASA. E-mail: ADs@easa.europa.eu

. 4. For any question concerning the technical conten t of the requirements in this AD, please contact: HPH spol. s r.o. Č áslavská 126, P.O. Box 112, 28401 Kutná Hora Czech Republic Tel. : +420 327 512633, email: info@hph.cz

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