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Looking for help please from anyone with current RN Jungly Merlin knowledge. With the conversion from HC3A to HC4A, most external differences between the HC3/HC3A have gone, The UK HC3 had a four-tank fuel system compared to five for the former Danish HC3A, and the respective cockpit and window layouts were significantly different. Externally, the HC3A could be easily distinguished from the HC3 by its distinctive nose cone, which was designed to enable a laser obstacle avoidance system to be fitted in addition to a weather radar and electro-optical device. The MLSP eliminated most of the differences including the nose cone that was such a distinctive feature of the HC3A. In this respect, the engine and transmission rating structures and the nose mounted electro-optical/infrared device are now common for both types. Elsewhere, the HC4A received a hydraulic rescue hoist to replace the original electric hoist, the cabin port door now slides rather than pushes open and the cabin egress windows are now standardised across the fleet to the HC3 configuration to improve emergency egress. However, the HC4 retains the HC3 heavy-duty cabin floor and four-tank fuel system whereas the HC4A retains the HC3A standard floor and five-tank system. This means there are still some external differences between the HC4 and HC4A. For example on the port side, the number of external refuelling points on the HC4 are two and they seem to have covers. On the HC4A there are 3 external refuelling points which do not have any covers. I have it in my head that the external cargo carrying systems are also different, presumably linked to the different cabin floor specs, Is that right?. If I wanted to convert an HC4 to an HC4A, what other changes would I need to make? Any views or advice would be gratefully received.