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SG (Simple Governor) mechanical-hydraulic speed droop governor · SG Governor
Obsolete
No longer orderable new (last-time-buy ended Apr 1, 2023).
The published repair window ended Oct 1, 2024. Contact Drake — overhaul may still be possible.
Drake-recommended replacement
Direct replacement.
| Preferred item | Description | Applies when |
|---|---|---|
| 8561-738 | PSG retrofit governor per Table 4-1 — speed adjusting shaft: Single Notched -19deg RH; terminal shaft: Single Serrated -RH; ballhead: Solid w/ 2 Weights; porting: 3 Slot; drive shaft: Std. Splined; governor mounting: Vertical; rotation: CCW; return spring type: Horizontal (RH); high speed stop: 4000; low speed stop: Adj. 0-1000; speed setting motor: None | High Speed Stop factory set at 4000. Needs High Speed Stop adjusted to 3900 upon installation. |
Note: AN 51650: Woodward inactivated the SG line and stopped all production; PSG is the designated replacement. Table 4-1 configuration columns describe the retrofit PSG unit (blank on rows with no retrofit PN; 'Reversible' rotation is a PSG-only capability). Conversion needs minor fuel-rack linkage and oil-routing adaption; PSG shafts/overall height ~1/2 inch (11 mm) taller; PSG oil inlet is left side only. S43 adversarial verify (render-validated per-cell rebuild): in the printed Table 4-1, 'Std.' is the first line of the Drive Shaft column ('Std. Splined'), not part of Porting, and 'Adj.' is the first line of the Low Speed Stop column ('Adj. NNNN'), not part of High Speed Stop. Config fields corrected to the printed column split; part-number mapping unchanged. Line-level dates per the SG Product Support Statement: production stopped April 1, 2023 (inactivation / last time buy); repairs based on availability through October 1, 2024.
Lifecycle facts
| Woodward part number | 8512-132 |
|---|---|
| Product family | SG Governor |
| Lifecycle status | Obsolete |
| Last-time-buy | Apr 1, 2023 |
| Inactivation | Apr 1, 2023 |
| Published repair window | Oct 1, 2024 |
| Source | Woodward Application Note 51650 rev – (06/2024), SG to PSG Governor Retrofit Guide (B51650_-.pdf) p.16; SG Product Support Statement pp.1-2 |
| Cross-reference confidence | Confirmed from the cited Woodward publication |
Source: PCN 51650
✓ Sourced directly from the cited Woodward publication — Drake confirms the exact part before quoting
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