Federal Department of the Environment, Transport, Energy and 

Communications DETEC

Federal Office of Civil Aviation FOCA

Safety Division - Aircraft

Lufttüchtigkeitsanweisung (LTA)

Consigne de Navigabilité (CN)

Direttive sulla Navigabilità (DN)

Airworthiness Directive (AD)

FOCA AD

HB-2013-009

Inkraftsetzung

Mise en vigueur

Entrata in vigore

Effective Date

21 October 2013 Pilatus – PC-7

FOCA TC/TCDS No: F 56-20

1/2

Rechtsgrundlage: Art. 26, 51 und 51A (Verordnung über die Lufttüchtigkeit von Luftfahrzeugen: SR 748.215.1)

Base juridique: Art. 26, 51 et 51A (Ordonnance sur la navigabilité des aéronefs: SR 748.215.1)

Base giuridica: Art. 26, 51 e 51A (Ordinanza concernente la navigabilità degli aeromobili: SR 748.215.1)

Legal base: Art. 26, 51 and 51A (Ordinance on the airworthiness of aircraft: SR 748.215.1)

Issue Date: 07 October 2013

ATA Chapter: ATA 24 – Electrical Power

Subject: Electrical Power / Electrical Harness in the Engine Compartment –

Inspection

Supersedure / Revised

AD(s):

Not applicable

Type Certificate 

Holder’s Name:

Pilatus Aircraft Ltd.

Manufacturer(s): Pilatus Aircraft Ltd.

Applicability: Model PC-7 aircraft, Manufacturers Serial Numbers (MSN) 101 through 

MSN 618.

Reason: This Airworthiness Directive (AD) is prompted due to a report of chafing of 

the wiring harness attached to the engine mounting frame on the RH side 

of the engine compartment. Due to the limited space available in this area 

the wiring harness can chafe against the RH flexible duct for the condenser.

Such a condition, if left uncorrected, could lead to a short circuit which 

could cause a fire in the engine compartment.

In order to correct and control the situation, this AD requires a one-time 

inspection of the wiring harness and flexible duct of the condenser for 

chafing. If major damage is found, the damaged parts must be replaced. If 

minor damage is found, this AD requires the installation of a protective 

sleeve on the wiring harness.

Required Action(s) 

and Compliance 

Time(s):

Required as indicated below, unless already accomplished:

(1) Within the next 90 days after the effective date of this AD, perform a 

visual inspection of the wiring harness and the flexible duct in the 

engine compartment for signs of chafing as required by paragraph 

(§) 3.B.(3) and (5) of PILATUS PC-7 Service Bulletin No. 24-009.

(2) If during the inspection required by § (1) of this AD, any signs of 

chafing and are found, prior to further flight, perform the corrective 

actions according to the instructions provided by § 3.B.(3), (6) and 

(7) of PILATUS PC-7 Service Bulletin No. 24-009.
Lufttüchtigkeitsanweisung (LTA)

Consigne de Navigabilité (CN)

Direttive sulla Navigabilità (DN)

Airworthiness Directive (AD)

FOCA AD

HB-2013-009

2/2

Rechtsgrundlage: Art. 26, 51 und 51A (Verordnung über die Lufttüchtigkeit von Luftfahrzeugen: SR 748.215.1)

Base juridique: Art. 26, 51 et 51A (Ordonnance sur la navigabilité des aéronefs: SR 748.215.1)

Base giuridica: Art. 26, 51 e 51A (Ordinanza concernente la navigabilità degli aeromobili: SR 748.215.1)

Legal base: Art. 26, 51 and 51A (Ordinance on the airworthiness of aircraft: SR 748.215.1)

Ref. Publication(s): PILATUS PC-7 Service Bulletin No. 24-009, initial issue.

The use of later approved revisions of this document is acceptable for 

compliance with the requirements of this AD.

For further information 

contact:

The applicable manufacturer’s documentation may be obtained directly 

from:

PILATUS AIRCRAFT LTD.

Customer Technical Support (MCC)

P.O. Box 992

CH-6371 Stans, Switzerland

Tel.: +41 (0)41 619 67 74 Fax: +41 (0)41 619 67 73

E-mail: Techsupport@pilatus-aircraft.com

For further information contact:

FEDERAL OFFICE OF CIVIL AVIATION (FOCA)

Design and Production (STEH)

CH-3003 Bern, Switzerland

Fax: +41 (0) 31 322 59 18

E-mail: airdir@bazl.admin.ch