61 STAT.] UNITED KINGDOM-AIR SERVICE FACILITIES-IaY -1946- 4011 July 31, 1946 U.K . Government will make periodic flight checks of operation of the installations in accordance with standard practice." 4. As regards the second paragraph in Section 5, the question of the A7e, p. 4009. operation of a range at the London Airport is now under examination in connection with the determination of the system of air traffic con- trol to be operated in the region. If a range at that Airport is found to be desirable, it will be operated in lieu of the range at Northolt. In that event the range at Northolt could be moved and I would suggest that, pending a decision on this matter, the range at Bovingdon should be left in situ. I am asking my technical officers to keep in touch with your Civil Air Attache on this matter. 5. The references in para. 1 (a) and (b) of your letter to the transfer An t e,p. 4008. of equipment "to Heathrow" should, of course, be qualified accord- ingly. 6. Subject to the above, I am very glad to confirm the understanding as set out in your letter. Yours sincerely, WINSTER. The Honourable W. A. HARRIMAN, Embassy of the UnitedStates of America, GrosvenorSquare, London, S.W .1 . DOC.D .363 ATC/D. 60 24/3/46. Extract of North Atlantic Route Service Conference, Dublin, 1946. 5.2 .8 . Requirements at Aerodromes designated as terminals or alter- nates for the North Atlantic: The Committee has recommended the following:- 5.2.8 .1 . That Approach and Aerodrome Controls be maintained or provided at such aerodromes. 5.2.8.2. That an instrument landing system as suggested by the Com Committee be a requirement at such aerodromes. This system consists of a runway localizer and glide path trans- mitter, together with either 2 or 3 fan markers, or one fan marker and either one or two M/F non-directional radio beacons. The ATo Committee consider, however, that the provision and location of the fan markers or non-directional beacons for air traffic control purposes should be the subject of continuing study with the object of obtaining a standard system. 5.2 .8 .8 . That existing M/F radio ranges now available or which may be made available for Approach Control at these Aerodromes should be retained in use until some such system as that
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