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Airworthiness Advisory Circulars - Part 6-65 - General advice
Part 6 - General advice
- AAC 6-65 - Use of Chloride Based Cleaners - Trichlorethylene, 111 Trichloretan, etc - 12/95
SAAB have issued a Service Newsletter which advises that use of chloride based detergents has caused stress corrosion in a filter bowl mounted on the hydraulic filter manifold on a SAAB 340 aircraft. As this problem may relate to other aircraft types, SAAB has kindly given their approval to reprint the SAAB Newsletter SN 340-9507 in its entirety.
29-07 Hydraulic Power - Use of Chloride Based Detergents
This Service Newsletter is issued to inform the operators that use of chloride based detergents can cause damage to the Filter Bowls on the Filter Manifold 9302211-002.
A cracked filter bowl has been returned to Saab and the vendor for investigation. A metallurgical investigation of the cracked filter bowl showed that the cracks were of stress corrosion nature, and the initiator most likely was presence of high concentration of chloride. The presence of chloride can be an indication that a chloride based detergent has been used (e.g for cleaning purpose prior to maintenance action). Damage on the components can occur long time after presence of Chloride.
To prevent this type of failure, operators are advised not to use chloride based detergents (trichlorethylene, 111 trichloretan etc.) on the filter manifold.
Also note that other components on the aircraft can be damaged if chloride based detergents are used.