- Models
- Propeller Blades, W670-16, W670-6A, W670-6N
- Data sheet
- TCDSE-162
- Registered aircraft
- 1,076 matched by model
- Product
- Appliance
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | d680abfa…67f2a5d | FAA DRS (API key needed) |
On this page
The airworthiness directive
50-12-01 HAMILTON STANDARD: Applies to All Aircraft Equipped With Continental Engines, Models W-670-6A (R-670-3, -5), W-670-6N (R-670-4), W-670-16 (R-670-8, -11, - 11A) and Hamilton Standard Ground Adjustable Propellers Having Blades, Model 11C1 (Navy 4350, 4350F, 4350F1).
Compliance required not later than April 15, 1950.
To minimize the possibility of propeller blade shank fatigue failures as a result of noncompliance with a mandatory engine operation restriction, the following precautionary measures should be taken:
(1) Check the marking on the engine tachometer and correctly mark it, if necessary, with a red arc which covers the entire r.p.m. range above the higher side of the 1,900 r.p.m. graduation.
(2) Install placard in aircraft to read: "Avoid all engine operation above 1,900 r.p.m. except during takeoff".
(3) Check position of the propeller and correctly index, if necessary, in the zero degree position (blades in line with crankthrow).
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1,076
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1916 | 1 |
|---|---|
| 1918 | 1 |
| 1927 | 4 |
| 1928 | 20 |
| 1929 | 31 |
| 1930 | 2 |
| 1931 | 10 |
| 1932 | 8 |
| 1933 | 10 |
| 1934 | 8 |
| 1935 | 5 |
| 1936 | 3 |
| 1937 | 11 |
| 1938 | 1 |
| 1939 | 4 |
| 1940 | 83 |
| 1941 | 190 |
| 1942 | 184 |
| 1943 | 174 |
| 1944 | 10 |
| 1945 | 15 |
| 1946 | 8 |
| 1947 | 5 |
| 1948 | 13 |
| 1949 | 10 |
| 1950 | 7 |
| 1951 | 8 |
| 1952 | 11 |
| 1953 | 3 |
| 1954 | 1 |
| 1955 | 2 |
| 1957 | 1 |
| 1959 | 4 |
| 1960 | 2 |
| 1962 | 5 |
| 1965 | 1 |
| 1973 | 1 |
| 1974 | 1 |
| 1977 | 1 |
| 1978 | 1 |
| 1979 | 1 |
| 1980 | 2 |
| 1981 | 1 |
| 1983 | 2 |
| 1984 | 4 |
| 1985 | 4 |
| 1986 | 1 |
| 1987 | 1 |
| 1991 | 1 |
| 1994 | 1 |
| 1995 | 2 |
| 1996 | 1 |
| 1998 | 2 |
| 1999 | 2 |
| 2004 | 1 |
| 2006 | 1 |
| 2008 | 1 |
| 2010 | 1 |
| 2017 | 1 |
| 2026 | 1 |
185 with no year recorded