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Measuring Instructions

Cambrai Covers Measuring Instructions.

At Cambrai Covers we go to great lengths to ensure that your cover fits your aircraft perfectly. It is of the utmost importance that any attachments on the aircraft such as Aerials, Probes, Pitot Tubes and Grab Handles have the proper allowances made for them.

The back of our order form shows a plan view of an aircraft. Use this for marking the positions of aerials and probes fitted to your aircraft. We will need to know the positions of anything mounted to the upper exterior of the aircraft (belly mounted items are not usually a problem). If you run out of space please use a plain piece of paper to sketch a diagram – it does not have to be brilliant, as it is the dimensions that are important!

Make all measurements from our datum point Top Edge of the Windscreen (TEWs) – this is the point where the Perspex windscreen meets the metal frame – and the centreline of the aircraft (C/L) which gives a definitive point. If a sliding canopy is fitted we use the canopy opening line in the same way as TEW/s.

1. Measure the Outside Air Temperature Probe (OAT) position if in the windscreen FORWARD of the TEWs and then left or right of the centreline. If the OAT is in a different position it will most likely be on our pattern.

2. Measure the positions of the aerial bases back from the TEWs and their position relative to the centreline measured to the centreline of the base. Show the size of the base and the type of aerial. For an example

PLEASE NOTE That EACH measurement should each be taken from the Top Edge of the Windscreen – not from aerial to aerial!

Types of Aerials.

VHF: – Usually take one of two forms.

1. Base and Whip type – measure to the front of the base and note the length of the base.

2. Blade type – measure to front of blade base and note maximum width of blade.

ADF: There are two type of ADF aerial – the traditional insulator and long wire to fin type, and the solid state combined loop and sense aerial.

We only need to know the position of the insulator for the traditional type of aerial. The solid state type is usually belly mounted and therefore will not be affected by the cover.

Glideslope Aerials: usually take the form of a ‘V’ or ‘Boomerang’.
Small types – often found on Piper aircraft – can be closed under a cover snood (hat).
Large types – often on Beechcraft types require a special type of closeout.
In both cases measure to the forward-most point on the aerial and note the length of each ‘Arm’ of the aerial and the distance between the widest point of the two ‘Arms’. If in doubt please include a rough sketch.

GPS Aerials:
1. ‘Shark Fin’ (‘Garmin’) type. Measure to the front of the base and note the length of the base and the maximum height of the aerial. A snood is fitted for this type of aerial.
2. Solid state ‘Flat’ type. Measure to the front of the aerial and note the length of the aerial and that it is a ‘FLAT type aerial. We fit a reinforcement for this type of aerial.

Anything Else: Please mark it on the form – too much information is better than not enough!