Fokker D.X

Documented type identification

Require explicit evidence connecting a designation, image or airframe record to D.X.

1. Which manufacturer or operator record explicitly identifies this aircraft as Fokker D.X? provenance
2. Does the identifier describe the aircraft type, an individual airframe or a later representation? boundary

Predecessor and neighbour separation

Track competing accounts of V.41 and D.VIII relationships without merging those designs into this entry.

1. Which contemporary evidence establishes the relationship between V.41 and the completed D.X? provenance
2. Which structural or installation differences distinguish D.X from D.VIII and D.IX? boundary

Wing and fuselage baseline

Record the parasol-wing geometry and verify materials, joints and attachment arrangements from suitable evidence.

1. Which drawings establish D.X wing dimensions, attachment positions and fuselage geometry? measurement
2. What evidence identifies the original materials and construction of the wing and fuselage? provenance

Control continuity and wing evidence

Require configuration-specific control and structural evidence; the archive reports a wing failure during a Spanish demonstration dive. [Fokker historical archive](https://www.fokker-history.com/en-gb/d-x)

1. Which records establish D.X control routing, travel and attachment inspection points? provenance
2. What investigation evidence identifies the failed wing configuration, failure mechanism and any resulting modifications? provenance
3. What unresolved structural evidence would prevent approval of a proposed load-bearing or flight activity? action

Engine and propeller compatibility

Use the reported 300 hp Hispano-Suiza 8Fb as a research baseline, with configuration-specific verification. [Fokker historical archive](https://www.fokker-history.com/en-gb/d-x)

1. Which engine subtype and power-rating convention are documented for each D.X configuration? measurement
2. Which propeller and mounting specifications are supported for that installation? provenance

Radiator operation and service evidence

Record radiator movement, controls and service requirements without assuming modern interlocks or generic engine instructions apply.

1. How were the D.X side radiators moved and retained, and what evidence describes their operating positions? definition
2. Which instructions specify fuel, lubricant, coolant and inspection requirements for the installed engine? provenance
3. What checks must precede any proposed engine run on an associated airframe? action

Wheel and ski applicability

Treat the documented Finnish ski-equipped aircraft as configuration evidence requiring airframe-level attribution.

1. Which serial numbers and acceptance records establish the Spanish and Finnish D.X deliveries? provenance
2. Was the Finnish ski installation original, interchangeable or a later modification, and to which aircraft did it apply? boundary

Armament and equipment authenticity

Require evidence for armament, sights and associated fittings on the configuration being described.

1. Which delivery documents establish the armament and sighting equipment actually fitted to each customer configuration? provenance
2. Does an observed fitting represent original service equipment, a replacement or a display reconstruction? boundary

Test configuration and limits

Separate measured results, advertised figures and documented operating restrictions.

1. What mass, engine setting, altitude and landing equipment accompanied each reported D.X performance figure? measurement
2. Which contemporary documents establish operating limits rather than merely reported maximum performance? provenance

Authenticity, condition and authority

Keep historical conformity, physical condition and action authorisation distinct.

1. Which original D.X components, replacements and undocumented alterations are present in the assessed airframe? provenance
2. What inspections and responsible authority are required for the proposed movement, engine run or flight in its present jurisdiction? action
3. Which historical acceptance requirements can actually be evidenced for this D.X configuration? provenance

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of Fokker D.X this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of Fokker D.X this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of Fokker D.X this model covers, and on what evidence? provenance

Failure modes and hazards

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these failure modes and hazards hold for the sense of Fokker D.X this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of Fokker D.X this model covers, and on what evidence? provenance