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Our method

The Aircrew Forever Foundation has placed the marking posts and the accompanying information boards based on its own research, supplemented with information found by others. The basis of the information are the reports of Mr. Gerrit Zwanenburg, former salvage officer in the Royal Netherlands Air Force, who carried out research into the salvage of the aircraft when the polder was drained.

We realize that the information can become outdated over the years, because people (can) tap new sources of information. However, new information is not necessarily correct information. That is what makes our work as a foundation so difficult. We would like to place the correct information on the signs and on the website. But when other information becomes available, we cannot immediately change everything. We always try to place the marking posts in the available public place that is closest to the place where the cockpit of an aircraft has come down. After all, an aircraft can be spread over a large area, so in the past we have determined that the cockpit is our measuring point. We are often approached with extra information, which could (partly) lead us to different insights. As a foundation, however, we have determined that we will only adjust piles when the new information can be regarded as irrefutably proven.

In our opinion, the signs can contain 3 types of errors:

  1. Errors in ranks and/or names that can be clearly identified.

  2. Other insights about, for example, the exact crash location.

  3. Disagreements about the layout of the boards.

In case of errors in category 1, we will adjust the sign on this marking post after checking.


In the case of errors in category 2, we will take the comments and/or comments to heart and, if reliable, include them on our website. If these new insights eventually lead to irrefutable evidence, so that the information on the sign has to be adjusted, we will do so. We will share this information via our website, so that we can form a publicly accessible file. This information must then be supplied to us, and it must be possible to check it by our own advisers. It is not a matter of whether our advisers agree with a new insight, but whether this new information could reasonably be correct. There will have to be some form of control before we place information on the site. We also want to know who provides the information. We do not include anonymous sources in our analyses. On request, we can place supplied information anonymously on our site, as long as we know who this information comes from.

We include differences of opinion in category 3 in our database. If the sign in question ever needs to be adjusted, we will include this information if necessary in the adjustment.

In addition, we want to make it clear that we as the 4 May Memorial Dronten Foundation are solely responsible for the marking posts in the municipalities of Dronten and Lelystad.

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