SCHEDULE OF AIRWORTHINESS DIRECTIVES
CESSNA 550 Citation II · Service Bulletins
Overview
This document is a Service Bulletin issued by the Civil Aviation Safety Authority of Australia, specifically addressing airworthiness directives for the Cessna 550 (Citation II) series aircraft. It outlines critical safety measures that must be taken regarding the freon air conditioning system and elevator control cables. The bulletin is aimed at operators and maintenance personnel of the Cessna 550, 551, and S550 series aircraft fitted with specific air conditioning systems. Compliance with the directives is essential to ensure the continued airworthiness and safety of the aircraft, particularly in preventing potential control loss due to reported defects.
- Deactivate the air conditioning system by pulling circuit breakers and securing them with tie wraps before further flight.
- Inspect elevator control cables in the aft baggage compartment for damage within 10 hours of service after April 18, 1990.
- Replace mounting hardware on the inboard rail and the existing earth wire as per Kieth Service Bulletin 108 before reactivating the air conditioning system.
- Failure to comply with these directives could lead to loss of control of the aircraft due to damaged elevator control cables.
- The directives apply to Cessna 550, 551, and S550 series aircraft with specific air conditioning systems.
Document
Source
Originally published by services.casa.gov.au. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 1990
- Pages
- 1
- File size
- 11 KB
- Publisher
- services.casa.gov.au
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In this document
Applicability
The directives apply to Cessna 550, 551, and S550 series aircraft equipped with STC SA 2698SW freon air conditioning systems.
Requirements
Operators must deactivate the air conditioning system by pulling the circuit breakers and securing them with tie wraps. A visual inspection of the elevator control cables in the aft baggage compartment is required to check for damage from arcing or chafing. Additionally, mounting hardware on the inboard rail must be replaced, and the existing earth wire should be replaced as per Kieth Service Bulletin 108.
Compliance
The compliance timeline specifies that the air conditioning system must be deactivated before further flight after April 18, 1990. The visual inspection of elevator control cables must be completed within 10 hours of service after the same date, and the air conditioning system must not be reactivated until the necessary replacements are made.
Background
The bulletin was issued following reports of arcing from the freon air conditioning unit, which has caused damage to elevator control cables. This defect poses a significant risk, potentially leading to loss of control of the aircraft if not addressed.
Safety notes
- A defect in the air conditioning unit could lead to arcing and damage to elevator control cables, risking loss of control.
Full document text
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 550 (Citation II) Series Aeroplanes AD/CESSNA 550/19 Freon Air Conditioner/Elevator Control Cable 7/90 TX Applicability: Model 550, 551 and S550 series fitted with STC SA 2698SW freon air conditioning systems. Requirement: 1. Deactivate the air conditioning system by pulling the airconditioner circuit breakers on the main junction box and install tie wraps to preclude inadvertent re- setting. 2. Visually inspect the elevator control cables under and in the vicinity of the aft baggage compartment floor for evidence of damage caused by either arcing or chafe. 3. Replace mounting hardware on the inboard mounting rail and replace existing earth wire in accordance with Kieth Service Bulletin 108. Note: FAA Emergency AD 90-07-10 refers. Compliance: 1. Prior to further flight after 18 April 1990. 2. Within 10 hours time in service after 18 April 1990. 3. Prior to reactivating the airconditioning system. Background: There has been a report of arcing from the freon airconditioning unit that has burned through an elevator control cable. A defect, if uncorrected, could lead to loss of control.