MIL-STD-704F
MIL-STD-704F Aircraft Electric Power Testing
Revision F, 12 March 2004
Programmable AC source to ≥180 V RMS L-N (≥271.8 V peak), 3-phase, 360–800 Hz plus 60 Hz, with phase-angle control and millisecond-resolution voltage/frequency envelope sequencing. DC sources to ≥50 V (28 V bus) and ≥350 V (270 V bus) with ripple injection.
This standard turns on
- 400 Hz
- voltage transients
- abnormal conditions
- emergency and starting modes
And says nothing about
- harmonic immunity sweeps
- humidity/bias reliability
- grid ride-through
Cited limits
Every value carries the clause, table or figure it comes from.
| Parameter | Value | Clause |
|---|---|---|
| Steady-state voltage (400 Hz AC, L-N) | 108.0–118.0 V RMS | Table I |
| Frequency | 393–407 Hz, modulation 4 Hz | Table I |
| Distortion factor | ≤0.05 | Table I |
| Crest factor | 1.31–1.51 | Table I |
| Peak voltage | ±271.8 V | Table I |
| Normal AC transient | surge 180 V for 10 ms; sag 80 V for 10 ms | Figure 3 |
| Abnormal AC overvoltage | V = 124.6 + 2.77/t for 0.05 ≤ t ≤ 6.925 s | Figure 4 |
| 28 VDC steady state | 22.0–29.0 V, ripple ≤1.5 V | Table IV |
| 28 VDC transient | 50 V for 12.5 ms; sag 18 V for 15 ms | Figure 13 |
| 270 VDC steady state | 250.0–280.0 V, ripple ≤6.0 V | Table IV |
| 270 VDC transient | 330 V for 20 ms; sag 200 V for 10 ms | Figure 16 |
| Emergency 28 V | 16–29 V | §5.3.2.3 |
| Electric starting | 12–29 V | §5.3.2.4 |
| Abnormal AC sustained | 125 V sustained (undervoltage mirror 100 V) | Figure 4 |
| Frequency rate of change | 250 Hz/s normal, 500 Hz/s abnormal | Table II |
| 28 VDC abnormal | V = 31.38 + 0.931/t; 31.5 V sustained (under 20.0 V) | Figure 14 |
Equipment for this standard
Further reading
- 28 VDC Aircraft Bus Testing: The Second Programme Inside MIL-STD-704F5 min · 37 cited facts
- CAGE, UEI and NAICS: What a Prime's Supplier-Vetting Search Actually Resolves5 min · 8 cited facts
- DFARS 252.204-7012 for Test-Equipment Suppliers: The 72-Hour Report and the Media You Must Not Wipe6 min · 5 cited facts
- DO-160 vs MIL-STD-704: Where Civil and Military Aircraft Power Standards Split6 min · 67 cited facts
- MIL-STD-1399 Testing: Your Contract May Cite a Cancelled Revision4 min · 23 cited facts
- Sizing a 400 Hz Source for Inrush: kVA Is the Last Number to Pick5 min · 33 cited facts
- Specifying Test Equipment in a Federal Contract: Name the Method, Freeze the Revision, Agree What Pass Means5 min · 25 cited facts
- Solid-State 400 Hz Sources vs Motor-Generator Sets: What Actually Changes3 min · 12 cited facts
- 400 Hz AC Source Buyer's Checklist: Sizing for Inrush, Crest Factor and Nonlinear Loads3 min · 9 cited facts
- MIL-STD-704F for Test Engineers: The Conditions Your AC Source Must Actually Reproduce4 min · 45 cited facts
Specifying a system for this standard?
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