Cross Reference
| Original part | Replacement | Type |
|---|---|---|
| LOCKHEED APP639A | Donaldson P528221 | Air Filter, Primary Round |
LOCKHEED part APP639A cross-references to Donaldson P528221 (Air Filter, Primary Round).
| Original part | Replacement | Type |
|---|---|---|
| LOCKHEED APP639A | Donaldson P528221 | Air Filter, Primary Round |