31 July 2011 C1 CIVIL AVIATION DEPARTMENT HONG KONG ...

CIVIL AVIATION DEPARTMENTHONG KONG, CHINAAirworthiness NoticeNo. 95Issue 531 January 2002USE OF HIGH INTENSITY ULTRA-VIOLET LAMPS INFLUORESCENT PENETRANT AND MAGNETIC PARTICLE INSPECTIONS1 Introduction1.1 The Director-General has been advised that the condition of some high intensity125 watt ultra-violet self filtered lamps used for fluorescent penetrant andmagnetic particle inspections may be unreliable due to the emission ofexcessive amounts of white light which could compromise reliability of theprocess to find small defects.1.2 As soon as practicable following the receipt of this Notice all high intensity 125watt ultra-violet self filtered lamps are required to be tested for excessivewhite light emission before use and any lamp failing this test is to be rejected.1.3 These ultra-violet lamps must also be periodically tested for excessive whitelight emission and any lamp failing this test shall be rejected.1.4 A mercury vapour lamp incorporating a woods glass filter which will obviatethis problem is available through normal suppliers of ultra-violet lamps.2 A Suitable Test Method to Determine the Acceptability of High Intensity 125 wattUltra-violet Lamps for Fluorescent Penetrant and Magnetic Particle Inspectionwith respect to White Light Emission2.1 The test involves quantitative analysis using a white light meter calibrated to aNational Standard.2.2 It is mandatory to perform this test prior to using any such lamp for inspectionpurposes. This test must also be applied to lamps periodically throughouttheir service life.2.3 Lamps which show evidence of having been painted shall not be used forinspection purposes.2.4 The test must be performed in a darkened area with ambient background lightlevels not greater than 2 foot candles.AN-95 P.131 January 2002